WO2016155011A1 - 一种分组数据网关的选择方法、相关装置及系统 - Google Patents

一种分组数据网关的选择方法、相关装置及系统 Download PDF

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Publication number
WO2016155011A1
WO2016155011A1 PCT/CN2015/075893 CN2015075893W WO2016155011A1 WO 2016155011 A1 WO2016155011 A1 WO 2016155011A1 CN 2015075893 W CN2015075893 W CN 2015075893W WO 2016155011 A1 WO2016155011 A1 WO 2016155011A1
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target
apn
mobility management
network element
management network
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PCT/CN2015/075893
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English (en)
French (fr)
Inventor
于游洋
李欢
靳维生
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华为技术有限公司
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Priority to CN201580066278.1A priority Critical patent/CN107005929B/zh
Priority to PCT/CN2015/075893 priority patent/WO2016155011A1/zh
Publication of WO2016155011A1 publication Critical patent/WO2016155011A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a packet data gateway method, related apparatus, and system.
  • 3GPP 3rd Generation Partnership Project
  • LTE Long Term Evolution
  • 2G second generation
  • 3G Third Generation
  • PS Packet Switching
  • Evolved 3GPP Packet Switched Domain also known as Evolved Packet System (EPS).
  • EPS Evolved Packet System
  • the core network of the new mobile communication network not only supports 3GPP access technology, but also supports non-3GPP (Non 3GPP) access technologies, such as Code Division Multiple Access 2000 (Code). Division Multiple Access 2000, CDMA2000), Worldwide Interoperability for Microwave Access (WiMAX), and Wireless Local Area Networks (WLAN).
  • Non 3GPP Non 3GPP access technologies, such as Code Division Multiple Access 2000 (Code). Division Multiple Access 2000, CDMA2000), Worldwide Interoperability for Microwave Access (WiMAX), and Wireless Local Area Networks (WLAN).
  • the user equipment When the user equipment (User Equipment, UE) accesses the EPC from the non-3GPP side, it can access from the trusted non-3GPP side, and can also be from the untrusted 3GPP. Side access.
  • the evolved Packet Data Gateway ePDG
  • the multiple access process or the handover process access uses a corresponding P-GW selection mechanism to select a Packet Data Network Gateway (P-GW) and selects the P-GW from the above.
  • P-GW Packet Data Network Gateway
  • the GW initiates a packet data network (PDN) connection establishment process; the P-GW needs to be a P-GW
  • the identifier ie, the P-GW ID
  • 3GPP AAA Server 3GPP Authentication, Authorization, and Accounting Server
  • 3GPP AAA Server 3GPP AAA Server
  • the received P-GW identifier is registered to the home subscriber server/system (HSS). So far, complete the P-GW selection to the registration process.
  • the process of registering the identity of the P-GW to the HSS requires an S6b interface between the P-GW and the 3GPP AAA Server.
  • the S6b interface is no longer deployed or the 3GPP AAA Server is not deployed separately.
  • the registration of the P-GW ID to the HSS cannot be implemented based on the existing solution, and the selection of the P-GW cannot be implemented, and the service continuity of the UE when moving from the Non 3GPP side to the 3GPP side cannot be guaranteed, which affects the user experience.
  • embodiments of the present invention provide a method, a device, and a system for selecting a packet data gateway, which can adapt to a new simplified network architecture and implement packet data gateway selection.
  • an embodiment of the present invention provides a method for selecting a packet data gateway P-GW, including:
  • the mobility management network element After the UE accesses the EPC from the non-3GPP network, the mobility management network element receives the request message sent by the non-3GPP access gateway;
  • a request type of the UE Determining, by the mobility management network element, a request type of the UE, where the request type includes the EPC accessed through an initial attach procedure, the EPC accessed through a handover procedure, or a location accessed through a multiple access procedure EPC;
  • the mobility management network element selects a target P-GW for the target access point name APN of the UE according to the request type;
  • the mobility management network element returns a response message to the non-3GPP access gateway according to the request message, where the response message includes the target APN and the identifier of the target P-GW.
  • the mobility management network element before the selecting, by the mobility management network element, the target P-GW for the target access point name APN of the UE, the mobility management network element further includes: The mobility management network element determines a target APN of the UE.
  • the method further includes: the mobility The management network element determines that the UE is accessing the EPC from a non-3GPP network.
  • the mobility management network element is configured to connect to the non-3GPP according to the request message.
  • the inbound gateway returns a response message, where the response message includes the target APN and the identifier of the target P-GW, including:
  • the APN configuration parameter corresponding to the target APN in the subscription data of the UE does not include the identifier of the P-GW, add the identifier of the target P-GW to the APN configuration parameter corresponding to the target APN;
  • the identifier of the P-GW included in the APN configuration parameter corresponding to the target APN is not the identifier of the target P-GW, and the mobility management network element identifies the identifier of the P-GW in the APN configuration parameter corresponding to the target APN.
  • the mobility management network element sending the response message to the non-3GPP access gateway, where the response message includes an APN configuration parameter corresponding to the target APN,
  • the APN configuration parameter corresponding to the target APN includes the identifiers of the target APN and the target P-GW.
  • an embodiment of the present invention provides a method for selecting a packet data gateway P-GW, including:
  • the non-3GPP access gateway After the user equipment UE accesses the evolved packet core network EPC from the non-3rd generation partner plan 3GPP network, the non-3GPP access gateway sends a request message to the mobility management network element;
  • the non-3GPP access gateway Receiving, by the non-3GPP access gateway, a response message sent by the mobility management network element according to the request message, where the response message includes a target access point name APN of the UE and a target selected for the target APN The identity of the P-GW;
  • the non-3GPP access gateway establishes a packet data network PDN connection between the non-3GPP access gateway and the target P-GW for the target APN according to the identifier of the target APN and the target P-GW. .
  • the method further includes: selecting the non-3GPP access gateway Select the mobility management network element.
  • the method further includes:
  • the non-3GPP access gateway selects the mobility management network element according to the pre-configuration information, where the pre-configuration information includes a correspondence between location information of the UE and an identifier of the mobility management network element, or The pre-configuration information includes a correspondence between an identifier of the non-3GPP access gateway and an identifier of the mobility management network element;
  • the non-3GPP access gateway sends the UE's International Mobile Subscriber Identity (IMSI) to the routing proxy node, so that the routing proxy node selects the mobility management network element for the UE according to the IMSI of the UE;
  • IMSI International Mobile Subscriber Identity
  • the non-3GPP access gateway constructs a fully qualified domain name of the mobility management network element according to the location information of the UE, and sends the fully qualified domain name to the domain name resolution server DNS, and the receiving the DNS is determined according to the fully qualified domain name.
  • the identifier of the mobility management network element selects a mobility management network element from the mobility management network element determined by the DNS as the mobility management network element.
  • an embodiment of the present invention provides a method for selecting a packet data gateway P-GW, including: mobility management after a user equipment UE accesses a non-third generation partnership plan 3GPP network to an evolved packet core network EPC.
  • the network element receives the request message sent by the non-3GPP access gateway;
  • the mobility management network element returns a response message to the non-3GPP access gateway according to the request message, where the response message includes a target APN of the UE, and a P-GW selected by the mobility management network element. And the identifier of the P-GW in the APN configuration parameter corresponding to the target APN, so that the non-3GPP access gateway selects the P-GW selected by the mobility management network element and the APN configuration corresponding to the target APN.
  • the target P-GW is selected for the target APN in the P-GW in the parameter.
  • the mobility management network element is Before the target access point name APN of the UE selects the P-GW, the method further includes: the mobility management network element determining the target APN of the UE.
  • the mobility management network element selects a P-GW according to the target access point name APN of the UE.
  • the method further comprises: the mobility management network element determining that the UE is accessing the EPC from a non-3GPP network.
  • an embodiment of the present invention provides a method for registering a packet data gateway P-GW, including:
  • the non-3GPP access gateway After the user equipment UE accesses the evolved packet core network EPC from the non-3rd generation partner plan 3GPP network, the non-3GPP access gateway sends a request message to the mobility management network element;
  • the non-3GPP access gateway receives a response message sent by the mobility management network element according to the request message, where the response message includes a target access point name APN of the UE, and the mobility management network element selection The identifier of the P-GW and the identifier of the P-GW in the APN configuration parameter corresponding to the target APN in the subscription data of the UE;
  • the non-3GPP access gateway is the target of the UE from the P-GW selected by the mobility management network element and the P-GW in the APN configuration parameter corresponding to the target APN according to the request type of the UE.
  • the APN selects a target P-GW; wherein the request type includes the EPC accessed through an initial attach procedure, the EPC accessed through a handover procedure, or the EPC accessed through a multiple access procedure;
  • the non-3GPP access gateway establishes a packet data network PDN connection between the non-3GPP access gateway and the target P-GW for the target APN according to the identifier of the target APN and the target P-GW. .
  • the method further includes: the non-3GPP access gateway selects the mobile Sex management network element.
  • the non-3GPP access gateway selects the mobility management network element according to the pre-configuration information, where the pre-configuration information includes a correspondence between the location information of the UE and the identifier of the mobility management network element. Relationship, or the pre-configuration information includes a correspondence between an identifier of the non-3GPP access gateway and an identifier of the mobility management network element;
  • the non-3GPP access gateway sends the UE's International Mobile Subscriber Identity (IMSI) to the routing proxy node, so that the routing proxy node selects the mobility management network element for the UE according to the IMSI of the UE;
  • IMSI International Mobile Subscriber Identity
  • the non-3GPP access gateway constructs a fully qualified domain name of the mobility management network element according to the location information of the UE, and sends the fully qualified domain name to the domain name resolution server DNS, and the receiving the DNS is determined according to the fully qualified domain name.
  • the identifier of the mobility management network element selects a mobility management network element from the mobility management network element determined by the DNS as the mobility management network element.
  • an embodiment of the present invention provides a mobility management network element, including:
  • a receiving unit configured to receive a request message sent by the non-3GPP access gateway after the user equipment UE accesses the evolved packet core network EPC from the non-3rd generation partner plan 3GPP network;
  • a determining unit configured to determine a request type of the UE, where the request type includes the EPC accessed through an initial attach procedure, the EPC accessed through a handover procedure, or the EPC accessed through a multiple access procedure ;
  • a selecting unit configured to select a target P-GW for the target access point name APN of the UE according to the request type
  • a sending unit configured to return a response message to the non-3GPP access gateway according to the request message, where the response message includes the target APN and an identifier of the target P-GW.
  • an embodiment of the present invention provides an access gateway, where the access gateway is an access gateway of a non-3th generation partner plan 3GPP network, and the access gateway includes:
  • a sending unit configured to send a request message to the mobility management network element after the user equipment UE accesses the evolved packet core network EPC from the non-3GPP network;
  • a receiving unit configured to receive a response message sent by the mobility management network element according to the request message, where the response message includes a target access point name APN of the UE and a target P- selected for the target APN GW's logo;
  • a establishing unit configured to establish, according to the identifier of the target APN and the target P-GW, a packet data network PDN connection between the access gateway and the target P-GW for the target APN.
  • the sending unit is further configured to select the mobility management network element before sending the request message to the mobility management network element.
  • the seventh aspect of the present invention provides a mobility management network element, including:
  • a receiving unit configured to receive a request message sent by the non-3GPP access gateway after the user equipment UE accesses the evolved packet core network EPC from the non-3rd generation partner plan 3GPP network;
  • a selecting unit configured to select a P-GW according to the target access point name APN of the UE
  • An acquiring unit where the identifier of the P-GW in the APN configuration parameter corresponding to the target APN in the subscription data of the UE is obtained;
  • a receiving unit configured to receive a response message sent by the mobility management network element according to the request message, where the response message includes a target access point name APN of the UE, and a P selected by the mobility management network element - an identifier of the GW and an identifier of the P-GW in the APN configuration parameter corresponding to the target APN in the subscription data of the UE;
  • a selecting unit configured to select, according to the request type of the UE, a P-GW selected by the mobility management network element and a P-GW in an APN configuration parameter corresponding to the target APN, for selecting a target APN of the UE a target P-GW; wherein the request type includes the EPC accessed through an initial attach procedure, the EPC accessed through a handover procedure, or the EPC accessed through a multiple access procedure;
  • the APN establishes a packet data network PDN connection between the access gateway and the target P-GW.
  • the sending unit is further configured to select the mobility management network element before sending the request message to the mobility management network element.
  • the request message is an authentication and authorization request message sent by the non-3GPP access gateway;
  • the response message is an authentication and authorization reply message.
  • the mobility management network element supports an authentication and authorization function of the non-3GPP access network.
  • part or all of the logical functions of the 3GPP AAA Server are integrated into the mobility management network element, and the non-3GPP side is implemented by the mobility management network element or by the mobility management network element and the non-3GPP access gateway.
  • the choice of P-GW not only simplifies the network architecture, but also adapts to the simplified network architecture to achieve P-GW selection.
  • 1 is a schematic diagram of a system architecture of an evolved packet system
  • FIG. 2(a) is a schematic diagram of an architecture of a 3GPP AAA Server and an MME according to an embodiment of the present invention
  • FIG. 2(b) is a schematic diagram of an architecture of a 3GPP AAA Server and an SGSN according to an embodiment of the present invention
  • FIG. 5 is a flowchart of still another method for selecting a packet data gateway according to an embodiment of the present invention.
  • FIG. 6 is a flowchart of still another method for selecting a packet data gateway according to an embodiment of the present invention.
  • FIG. 7 is a schematic diagram of a mobility management network element according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of an access gateway according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of still another access gateway according to an embodiment of the present invention.
  • FIG. 11 is a schematic structural diagram of a device for selecting a P-GW according to an embodiment of the present invention.
  • the core network EPC mainly includes a Mobility Management Entity (MME) and a General Packet Radio Service (GPRS) service support node (Serving GPRS Support). Node, SGSN), Serving Gateway (S-GW), and P-GW; wherein the MME is mainly responsible for non-access stratum (NAS) signaling with the user equipment, and is a user equipment.
  • MME Mobility Management Entity
  • GPRS General Packet Radio Service
  • S-GW Serving Gateway
  • P-GW Packet Radio Service
  • NAS non-access stratum
  • the S-GW is a mobility anchor for switching between the local eNodeBs, and providing a lawful interception related function;
  • the GW is mainly responsible for user address allocation, policy control and enforcement of charging rules, and lawful interception related functions.
  • the UE can access through the interface between the trusted non-3GPP access network and the P-GW, for example, through a trusted WLAN access network (TWAN) and P.
  • TWAN trusted WLAN access network
  • the S2a interface between the GW and the P-GW can also be accessed through the interface between the non-trusted non-3GPP access network and the P-GW, for example, through the S2b interface between the ePDG and the P-GW, where the ePDG /TWAN is mainly responsible for forwarding the Internet Protocol (IP) address of the mobile network of the UE allocated by the P-GW, registering the local IP address of the UE, and binding the mobile IP address of the UE with the local IP address.
  • IP Internet Protocol
  • 3GPP AAA server When accessing from a non-3GPP network, another important network element is a 3GPP AAA server, which is mainly responsible for implementing an authentication and authorization operation for the UE through interaction with the HSS, and a P-GW identifier used for each PDN connection established by the UE.
  • the information is registered in the HSS, and the HSS is mainly used to store the user's subscription information.
  • the operator wants to simplify the network architecture as much as possible.
  • the S6b interface is no longer deployed or the 3GPP AAA server is not deployed separately and its functions are integrated with the existing EPC network elements.
  • the registration of the GW ID to the HSS does not even enable the selection of the P-GW, so that the service continuity of the UE when moving from the Non 3GPP side to the 3GPP side cannot be guaranteed.
  • the embodiment of the present invention provides a P-GW selection method, which can integrate part or all of the logical functions of the 3GPP AAA Server into the mobility management network element, by the mobility management network element or by mobility.
  • the management network element and the non-3GPP access gateway jointly implement the selection of the P-GW on the non-3GPP side, which not only simplifies the network architecture, but also implements P when the S6b interface is no longer deployed or the 3GPP AAA Server is not deployed separately. -GW selection and registration.
  • the mobility management network element may be an MME, and may also be an SGSN (such as GnGp-SGSN or S4-SGSN); a non-3GPP access gateway, that is, an access gateway of a non-3GPP network, may be an ePDG, It can also be a TWAN or a High Rate Packet Data (HRPD) HRPD Serving Gateway (HSGW), which is not limited herein.
  • SGSN such as GnGp-SGSN or S4-SGSN
  • a non-3GPP access gateway that is, an access gateway of a non-3GPP network
  • ePDG ePDG
  • It can also be a TWAN or a High Rate Packet Data (HRPD) HRPD Serving Gateway (HSGW), which is not limited herein.
  • HRPD High Rate Packet Data
  • HSGW High Rate Packet Data
  • FIG. 2(a) an architecture diagram of the 3GPP AAA Server and the MME is proposed, as shown in FIG. 2(a).
  • Deploying the logical function of the 3GPP AAA Server to the MME upgrading the S6a interface between the MME and the HSS, supporting the SWx interface between the 3GPP AAA Server and the HSS, or adding an independent SWx interface between the MME and the HSS, ePDG and 3GPP AAA Server
  • the SWm interface between the MME and the 3GPP AAA Server is no longer deployed, and the SWa interface between the 3GPP AAA Server and the non-trusted 3GPP access network can be deployed. , greatly simplifying the network architecture.
  • the MME can be replaced by the SGSN, that is, the logical function of the 3GPP AAA Server is deployed to the SGSN, and accordingly, the S6a interface between the MME and the HSS is replaced with the S6d interface or the Gr interface between the SGSN and the HSS (if supported) MAP protocol), the S11 interface between the MME and the S-GW is replaced by S4 between the SGSN and the S-GW, and FIG. 2(b) shows an architectural diagram of the convergence of the 3GPP AAA Server and the SGSN.
  • the ePDG can also be replaced with a TWAN/HSGW, and accordingly, the ePDG and The SWm interface between the MME/SGSN is replaced with the STa interface between the TWAG/HSGW and the MME/SGSN, and the S2b interface between the ePDG and the P-GW is replaced by the S2a interface between the TWAN/HSGW and the P-GW.
  • the S6b interface between the TWAN/HSGW and the 3GPP AAA Server is no longer deployed, and the SWa interface between the 3GPP AAA Server and the trusted 3GPP access network can be deployed no longer, which greatly simplifies the network. Architecture.
  • an embodiment of the present invention provides a method for selecting a packet data gateway P-GW, which can integrate some or all of the logical functions of the 3GPP AAA Server into the mobility management network element, and utilize the mobility management network.
  • the element implements the selection of the P-GW, and the specific method is as follows.
  • the mobility management network element After the UE accesses the EPC from the non-3GPP network, the mobility management network element receives the request message sent by the non-3GPP access gateway.
  • an interface may be added between the mobility management network element and the non-3GPP access gateway for message/signaling interaction, such as a SWm interface or an STa interface.
  • the request message and the subsequent response message of the request message may be transmitted through an added interface between the mobility management network element and the non-3GPP access gateway.
  • the mobility management network element determines a request type of the UE, where the request type includes the EPC accessed through an initial attach procedure, the EPC accessed through a handover procedure, or accessed through a multiple access procedure.
  • the EPC includes the EPC accessed through an initial attach procedure, the EPC accessed through a handover procedure, or accessed through a multiple access procedure.
  • the mobility management network element may adopt different P-GW selection mechanisms for the EPC that the UE accesses through the initial attach process or the handover process or the multiple access process. Therefore, the MME may determine the type of request of the UE, that is, determine that the UE is a pass. The initial attach procedure or the EPC accessed through the handover procedure or through the access procedure.
  • the mobility management network element may be determined by receiving the request type or the request type information sent by the non-3GPP access gateway, or may determine by itself whether the UE has a context corresponding to the target APN. It is determined that the embodiment of the present invention is not limited herein, and the information of the request type may be information generated according to the request type, and the mobility management network element determines the request of the UE according to the information of the request type. Types of. For example, the non-3GPP access gateway may determine the request type, and notify the mobility management network element of the request type or the request type information by using the request message or other type message, so that the The mobility management network element can determine the type of request for the UE.
  • the mobility management network element may use the International Mobile Subscriber Identification Number (IMSI) of the UE and the target APN to determine whether the UE and the UE are already present on the mobility management network element. Determining the context of the target APN, if yes, determining that the request type is the EPC accessed through the handover procedure or the EPC accessed through the multiple access procedure, otherwise determining that the request type is through an initial attach procedure The EPC accessed.
  • IMSI International Mobile Subscriber Identification Number
  • the mobility management network element selects a target P-GW for the target access point name APN of the UE according to the request type.
  • the mobility management network element may determine the target APN of the UE before selecting the target P-GW. Specifically, if the UE requests the APN, the MME may use the APN requested by the UE as the target APN; Otherwise, the MME may use the default APN in the subscription data of the UE as the target APN.
  • the mobility management network element may select the target P-GW according to the target APN, or according to the identifier of the target APN and the non-3GPP access gateway or according to the target APN and Selecting, by the local IP address of the UE, the target P-GW, so that a P-GW that is closer to the UE/the closest P-GW may be selected as the target P-GW, where the local IP address of the UE refers to the The IP address assigned to the UE by a non-3GPP access network (such as WLAN, CDMA2000, or WiMAX, etc.).
  • a non-3GPP access network such as WLAN, CDMA2000, or WiMAX, etc.
  • the mobility management network element may obtain the identifier of the P-GW in the APN configuration parameter (APN-Configuration, AVP) corresponding to the target APN in the subscription data of the UE, that is, the subscription data of the UE.
  • APN-Configuration, AVP APN configuration parameter
  • the identifier of the P-GW corresponding to the target APN, and the P-GW in the APN configuration parameter corresponding to the target APN is used as the target P-GW.
  • S301 may be performed before S302 and S303, or may be performed after S302 and S303, which is not limited herein.
  • the mobility management network element returns a response message to the non-3GPP access gateway according to the request message, where the response message includes the target APN and the identifier of the target P-GW.
  • the mobility management network element may send the identifier of the target APN and the target P-GW to a non-3GPP access gateway by using a response message in response to the request message, such as an authentication and authorization response (Authentication and Authorization Answer) ) messages, thereby saving signaling interactions.
  • the non-3GPP access gateway may establish, according to the identifier of the target APN and the target P-GW, a packet data network PDN between the non-3GPP access gateway and the target P-GW for the target APN. connection.
  • the mobility management network element is described in the subscription data of the UE.
  • the APN configuration parameter corresponding to the target APN includes the identifier of the target P-GW and the target APN. Otherwise, the APN configuration parameter corresponding to the target APN includes only the identifier of the target P-GW that does not include the target P-GW. Therefore, when the response message is sent, the APN configuration parameter corresponding to the target APN can be utilized.
  • the identifier of the target P-GW is added to the APN configuration parameter corresponding to the target APN;
  • the identifier of the P-GW included in the APN configuration parameter corresponding to the target APN is not the identifier of the target P-GW, and the mobility management network element uses the P-GW in the APN configuration parameter corresponding to the target APN.
  • the identifier is replaced by the identifier of the target P-GW; the mobility management network element sends a response message to the non-3GPP access gateway, where the response message includes an APN configuration parameter corresponding to the target APN,
  • the APN configuration parameter corresponding to the target APN includes the foregoing The identity of the target APN and the target P-GW.
  • part or all of the logical functions of the 3GPP AAA Server are integrated into the mobility management network element, which simplifies the network architecture, so that the mobility management network element can receive the request message sent by the non-3GPP access gateway, and Selecting a target P-GW for the UE accessing from the non-3GPP network, and returning a response message including the target APN of the UE and the identifier of the target P-GW to the non-3GPP access network, adapting to a simplified network architecture implementation The choice of P-GW.
  • the identifier of the target P-GW may not be registered to the HSS. This is because, in the prior art, the identity of the target P-GW must be registered to the HSS to ensure that the UE uses the same P-GW when switching between the 3GPP network and the non-3GPP network.
  • the new simplified network architecture since the new simplified network architecture is adopted, whether the UE accessing from the 3GPP network or the UE accessing from the non-3GPP network is performed by the mobility management network element for the target P-GW. Selecting, therefore, when switching, it can be ensured that the 3GPP network uses the same P-GW as the non-3GPP network, and thus the P-GW may not be registered to the HSS.
  • the identifier of the target P-GW may be registered to the HSS to complete the selection and registration process of the target P-GW. Accordingly, the method may further include:
  • the mobility management network element sends a notification message (Notify Request) to the home subscriber server HSS, where the notification message includes an identifier of the target APN and the target P-GW to use the target P-GW.
  • the identity is registered to the HSS.
  • the process of registering the identifier of the P-GW to the HSS in the prior art requires the S6b interface between the P-GW and the 3GPP AAA Server.
  • the interface between the mobility management network element and the HSS is directly The identity of the P-GW is registered to the HSS.
  • the mobility management network element is The target APN of the UE selects the target P-GW, and the mobility management network element needs to determine the request type of the UE when selecting the target P-GW.
  • the mobility management network For the UE accessed through the initial attach procedure, the mobility management network The target P-GW is selected based on the target APN, and the UE accessing through the handover procedure or the multiple access procedure is using the P-GW in the APN configuration parameter corresponding to the target APN in the subscription data of the UE.
  • Target P-GW The embodiment of the present invention further provides a P-GW selection method, which is different from the previous embodiment.
  • the MME does not need to determine the request type of the UE, and the MME only needs to determine the target APN, and based on the foregoing
  • the target APN selects the P-GW, and sends the identifier of the P-GW selected by the MME, the target APN, and the identifier of the P-GW in the APN parameter corresponding to the target APN to the non-3GPP access gateway.
  • the non-3GPP access gateway selects the target P-GW from the P-GW selected by the MME and the P-GW in the APN configuration parameter corresponding to the target APN according to the request type of the UE.
  • the method can be as shown in FIG.
  • S401 After the user equipment UE accesses the evolved packet core network EPC from the non-3rd generation partner plan 3GPP network, the mobility management network element receives the request message sent by the non-3GPP access gateway.
  • S401 can refer to S301, and details are not described herein again.
  • the mobility management network element selects a P-GW according to the target access point name APN of the UE.
  • the mobility management network element does not need to determine the access type of the UE, and may directly select a P-GW according to the target APN, for example, the mobility management network element may And selecting a P-GW according to the identifier of the target APN and the non-3GPP access gateway, or according to the target APN and the local IP address of the UE.
  • the mobility management network element may also determine a target APN for the UE, and may refer to other embodiments as to how to determine the target APN and how to select a P-GW based on the target APN.
  • the mobility management network element acquires an identifier of the P-GW in the APN configuration parameter corresponding to the target APN in the subscription data of the UE.
  • the mobility management network element may acquire the subscription data of the UE from the HSS, where the subscription data of the UE includes at least one set of APN configuration parameters, where the APN configuration parameter includes an identifier of the APN and its corresponding P-GW. If the UE is accessed through an initial process, the identity of the P-GW may be default.
  • the mobility management network element may determine, from the subscription data of the UE, the target APN Corresponding APN configuration parameters, the APN configuration parameters corresponding to the target APN include the identifiers of the target APN and the P-GW.
  • the mobility management network element returns a response message to the non-3GPP access gateway according to the request message, where the response message includes a target APN of the UE, and a P selected by the mobility management network element.
  • the mobility management network element may send the foregoing information to the non-3GPP access gateway by using a response message of the request message, such as an authentication and an authorization reply message, so that the non-3GPP access gateway moves from the mobile device
  • a response message of the request message such as an authentication and an authorization reply message
  • the non-3GPP access gateway may determine a request type of the UE.
  • the request type is the EPC accessed through an initial attach procedure
  • the non-3GPP access gateway may select the P-GW selected by the mobility management network element as the target P-GW.
  • the request type is the EPC accessed through the handover procedure or the multiple access procedure
  • the non-3GPP access gateway may select the P-GW in the APN configuration parameter corresponding to the target APN as the target P- GW.
  • the non-3GPP access gateway establishes, according to the identifier of the target APN and the target P-GW, a packet data network between the non-3GPP access gateway and the target P-GW for the target APN. PDN connection.
  • part or all of the logical functions of the 3GPP AAA Server are integrated into the mobility management network element, which simplifies the network architecture. And based on the fused network architecture, the mobility management network element may receive the request message sent by the non-3GPP access gateway, may select the P-GW for the UE accessed from the non-3GPP network, and return the information to the non-3GPP access gateway.
  • the request type is selected from the P-GW selected by the mobility management network element and the APN configuration parameter corresponding to the target APN.
  • the P-GW is selected in the P-GW to adapt to the simplified network architecture to implement the P-GW selection.
  • the MPLS network architecture is used.
  • the identifier of the P-GW may not be registered to the HSS, and the same P-GW may be used by the 3GPP network and the non-3GPP network.
  • the identifier of the P-GW may be registered to the HSS, and the existing HSS network element is not modified.
  • the method may further include:
  • the mobility management network element receives the identifier of the target P-GW sent by the non-3GPP access gateway, or the mobility management network element may also determine a request type of the UE, according to the request of the UE Type, the target P-GW is determined from the P-GW selected by the mobility management network element and the P-GW in the APN configuration parameter corresponding to the target APN, so that the mobility management network element can be sent to the home subscriber server
  • the HSS sends a notification message, the notification message including an identifier of the target APN and the target P-GW to register an identifier of the target P-GW to the HSS; optionally, the non-3GPP access
  • the gateway may send the identifier of the target P-GW to the mobility management network element after the PDN connection is successfully established.
  • the APN configuration parameter corresponding to the target APN originally includes the target APN and the identifier of the P-GW corresponding to the target APN (that is, the target APN corresponding to the subscription data of the UE.
  • the identifier of the P-GW in the APN configuration parameter, and the mobility management network element corresponding to the target APN of the UE, the identifier of the P-GW selected by the mobility management network element, and the target APN When the identifier of the P-GW in the APN configuration parameter is sent to the non-3GPP access gateway, the APN configuration parameter corresponding to the target APM may be utilized.
  • the mobility management network element may add a first parameter indicating an identifier of the P-GW selected by the mobility management network element to the response message, and send the identifier to the non-3GPP access gateway.
  • the response message includes the APN configuration parameter corresponding to the target APN and the first parameter.
  • the mobility management network element may add a second parameter for indicating an identifier of the P-GW selected by the mobility management network element to the APN configuration parameter corresponding to the target APN, and connect to the non-3GPP.
  • the inbound gateway sends a response message, where the response message includes an APN configuration parameter corresponding to the target APN, and the APN configuration parameter corresponding to the target APN includes the second parameter.
  • the response message may be an authentication and authorization reply message.
  • the mobility management network element supports an authentication authorization function of the non-3GPP access network.
  • the method further includes: the non-3GPP connection
  • the ingress gateway selects the mobility management network element.
  • the non-3GPP access gateway selects the mobility management network element according to the pre-configuration information; wherein the pre-configuration information includes a correspondence between the location information of the UE and the identifier of the mobility management network element.
  • the pre-configuration information includes a correspondence between the identifier of the non-3GPP access gateway and the identifier of the mobility management network element;
  • the non-3GPP access gateway sends the UE's International Mobile Subscriber Identity (IMSI) to the routing proxy node, so that the routing proxy node selects the mobility management network element for the UE according to the IMSI of the UE.
  • IMSI International Mobile Subscriber Identity
  • the non-3GPP access gateway constructs a fully qualified domain name of the mobility management network element according to the location information of the UE, and sends the fully qualified domain name to the domain name resolution server DNS, and the receiving the DNS is completely qualified according to the An identifier of the mobility management network element determined by the domain name, selecting a mobility management network element from the mobility management network element determined by the DNS as the mobility management network element, so that a mobile device that is closer to the UE may be selected. Sex management network element.
  • the mobility management network element is the MME and the non-3GPP access gateway is the ePDG.
  • the mobility management network element is the SGSN or the non-3GPP access gateway is the TWAN/HSGW, the following method may also be used.
  • the selection and registration of the GW are not described herein again.
  • an embodiment of the present invention provides a P-GW selection method, as shown in FIG. 5.
  • the UE sends an IKE authentication request message (Internet Key Exchange_Authentication request message, IKE_AUTH request message) to the ePDG.
  • IKE authentication request message Internet Key Exchange_Authentication request message, IKE_AUTH request message
  • the non-3GPP access gateway is not an ePDG, for example, the TWAN/HSGW
  • the IKE authentication request message that the UE interacts with the evolved packet data network element may be replaced with other types of messages.
  • the non-3GPP access gateway is not the ePDG, for example, the TWAN/HSGW, or the mobility management network element is not the MM, for example, the SGSN
  • the method of S502-S514 may be directly adopted, or some of the message names may be replaced.
  • the selection method of the P-GW of the embodiment of the present invention is adopted.
  • the ePDG sends an authentication and authorization request message to the MME, where the authentication and authorization request message includes a request type, where the request type includes the EPC accessed through an initial attach procedure, or is accessed through a handover process.
  • the ePDG may determine the request type of the UE according to whether the IP address of the UE is included in the IKE authentication request message or whether it is an all-zero IP address.
  • the request type may indicate an EPC through which the access procedure is accessed by the UE, and the request type includes the EPC accessed through a handover procedure or an initial attach procedure or a multiple access procedure. Specifically, if the IP address of the UE in the IKE authentication request message includes an IP address that is not all zeros, it is determined that the UE is an EPC accessed through a handover procedure or a multiple access procedure, otherwise, It is determined that the UE is an EPC accessed through an initial attach procedure.
  • the ePDG may send the request type to the MME by using the authentication and authorization request message, where the authentication and authorization request message is used to request authentication and authorization for the UE.
  • the ePDG may define a parameter, such as a request type or an attachment type, in the authentication and authorization request message, when the UE is accessed through a handover process or a multiple access procedure.
  • the ePDG may set the value of the request type or the attachment type to “handover” or “multiple access”, when the UE is accessed through an initial attach procedure, Setting the value of the request type or the attachment type to "initial attach” or “initial request”, so that the MME according to the parameter in the authentication and authorization request message (that is, the type of request or attachment type), you can know the UE
  • the ePDG may define a 32-bit unsigned integer parameter in the authentication and authorization request message, such as DER-SWm-Flags, when the UE is accessed through the initial attach procedure. The 0th bit of the parameter is set to 1.
  • the ePDG may also send the request type to the MME by using other messages. It should be noted that the ePDG may also not send the request type of the UE to the MME, but the MME itself determines the request type of the UE.
  • the ePDG may send the APN requested by the UE to the MME by using the authentication and authorization request message, where The authentication and authorization request message may further include the APN requested by the UE, or the ePDG may send the information of the APN requested by the UE to the MME by using other messages.
  • the authentication and authorization request message may further include a local IP address (UE local IP) of the UE, where the local IP address of the UE is allocated by the non-3GPP access network to the UE. IP address.
  • the local IP address of the UE is used to establish an IPSec process with the ePDG. Therefore, the ePDG may obtain the local IP address of the UE and send the address to the MME.
  • the HSS returns an authentication response message to the MME, where the authentication response message includes an authentication vector of the UE.
  • the MME authenticates the UE by using an authentication vector of the UE.
  • the authentication process of the S503-S505 is similar to the process of authenticating the UE by the 3GPP AAA Server in the prior art, and details are not described herein again.
  • Non-3GPP IP Access Registration request (Non-3GPP IP Access Registration request) message or an update location to the HSS.
  • An update location request message is requested to obtain subscription data of the UE.
  • the HSS returns a non-3GPP IP Access Registration response (Non-3GPP IP Access Registration response) message or an update location response (Update Location Response) message to the MME, where the non-3GPP IP access registration corresponding message Or the update location response message carries the subscription data of the UE.
  • Non-3GPP IP Access Registration response Non-3GPP IP Access Registration response
  • Update Location Response Update Location Response
  • the HSS may save the identifier of the MME and complete registration of the MME to the HSS.
  • the MME may authorize the UE according to the subscription data of the UE.
  • a MME selects a target P-GW for the UE
  • the ePDG selects a target P-GW for the UE
  • the MME and the ePDG The mechanism for selecting the target P-GW is not the same.
  • the MME may also select a target P-GW for the UE. Therefore, the MME may determine whether the UE accesses from the 3GPP network or the non-3GPP network before selecting the target P-GW for the UE. For the UE accessing the non-3GPP network, the S509 may be performed to perform the P-GW. s Choice. For the UE accessing the 3GPP network, the P-GW can be selected in the manner of the prior art.
  • the embodiment of the present invention is not limited herein. For example, if the MME receives the authentication and authorization request message sent by the ePDG for the UE, it may be determined that the UE is accessed from a non-3GPP network; and, for example, the MME may provide according to the ePDG.
  • the RAT type or request type determines that the UE is accessing from a non-3GPP network.
  • the MME determines a target APN, and selects a target P-GW according to the request type.
  • the MME may set the APN configuration parameter in the subscription data of the APN requested by the UE and the UE. The APN in the matching is performed. If the matching is performed, the APN requested by the UE is used as the target APN. Otherwise, the MME may reject the authentication and authorization request of the UE. If the UE does not request the APN, the MME may The default APN in the subscription data is used as the target APN.
  • the MME may adopt different P-GW selection mechanisms for the EPC that the UE accesses through the initial attach procedure or the handover procedure or the multiple access procedure. Therefore, the MME may determine, according to the request type of the UE, whether the UE is accessed by the initial attach procedure or the handover procedure or the multiple access procedure.
  • the MME may select a target P-GW according to the target APN, for example, the MME may send the target APN to the DNS server, and the DNS server may return to the MME.
  • a P-GW list (PGW list or P-GW list) of the target APN can be connected, and the MME can select an appropriate P-GW from the P-GW list; further, the MME can be based on the target APN and The identifier (ePDG ID) of the ePDG may be selected according to the target APN and the IP address of the UE, and in this manner, a P-GW that is closer to the UE may be selected, for example,
  • the MME may send a DNS query message to the DNS server to request to obtain a P-GW that can connect to the target APN, and receive a P-GW list returned by the DNS server, according to the identifier of the ePDG or the IP address of the UE.
  • a P-GW that is closest/closer to the UE is
  • the MME sends an authentication and authorization reply message to the ePDG, where the authentication and authorization reply message includes an APN configuration parameter corresponding to the target APN, where the APN configuration parameter corresponding to the target APN includes the The identity of the target APN and the target P-GW.
  • the ePDG establishes a PDN connection with the target P-GW for the target APN.
  • the ePDG does not need to determine whether the UE accesses through an initial attach procedure or through a handover procedure or a multiple access procedure, and does not need to select a target APN and a target P-GW.
  • the identifiers of the target APN and the target PGW are obtained from the APN configuration parameters corresponding to the target APN, and the PDN connection is established according to the target APN and the target P-GW.
  • the MME sends a notification request (Notify Request) message to the HSS, where the notification request message includes an identifier of the target APN and the target P-GW to register the identifier of the target P-GW. To the HSS.
  • Notify Request a notification request (Notify Request) message
  • the MME may register the identifier of the target P-GW to the HSS, and prevent the identifier of the target P-GW from being registered to the HSS when the PDN connection establishment fails. .
  • S512 is an optional step, and the MME may also register the identifier of the target P-GW to the HSS after selecting the target P-GW for the target APN, without determining whether the PDN connection is successfully established.
  • S512-S514 is an optional step, and the MME may also not register the identifier of the target P-GW to the HSS, and may also ensure that the 3GPP and the non-3GPP use the same P-GW.
  • an embodiment of the present invention further provides a P-GW selection method, as shown in FIG. 6.
  • the MME selects a target P-GW for the target APN.
  • the MME selects a P-GW for the target APN, and the ePDG determines whether to use the MME according to the current process of the UE.
  • the P-GW is used as the target P-GW, and the specific method is as follows. S601-S608 may refer to S501-S508, and details are not described herein again.
  • the mobility management network element is the SGSN or the non-3GPP access gateway is the TWAN/HSGW, the following method may also be used to select the P-GW.
  • S601 The UE sends an IKE authentication request message to the ePDG.
  • the ePDG sends an authentication and authorization request message to the MME.
  • the ePDG does not need to send the request type of the UE to the MME, and the authentication and authorization request message may not include the request type of the UE.
  • the MME supports the authentication and authorization functions of the non-3GPP access network.
  • the MME sends an authentication request message to the HSS to request to obtain an authentication vector of the UE.
  • the HSS returns an authentication response message to the MME, where the authentication response message includes an authentication vector of the UE.
  • the MME authenticates the UE by using an authentication vector of the UE.
  • the MME When authenticating the UE, the MME sends a non-3GPP IP access registration request message or an update location request message to the HSS to request to acquire subscription data of the UE.
  • the HSS returns a non-3GPP IP access registration response message or an update location response message to the MME, where the non-3GPP IP access registration corresponding message or the update location response message carries the subscription data of the UE.
  • the MME may authorize the UE according to the subscription data of the UE.
  • the MME determines that the UE accesses an EPC from a non-3GPP network.
  • S609 The MME determines a target APN, and selects a P-GW according to the target APN.
  • the MME does not determine the request type of the UE, but selects the P-GW according to the target APN; further, the MME may be based on the target APN and the identifier of the ePDG (ePDG ID) or The P-GW may be selected according to the target APN and the IP address of the UE to select a P-GW that is closer to the UE.
  • the MME may refer to S509 according to the manner in which the target APN selects the P-GW, according to the target APN and the identifier of the ePDG (ePDG ID), and according to the target APN and the IP address of the UE.
  • the MME sends an authentication and authorization reply message to the ePDG, where the authentication and authorization reply message includes the target APN, the identifier of the P-GW selected by the MME, and the subscription data of the UE.
  • the APN configuration parameter corresponding to the target APN in the subscription data of the UE includes the identifier of the P-GW corresponding to the target APN in the subscription data of the target APN and the UE (that is, the The MME may define a new parameter PGW ID for indicating the identifier of the P-GW selected by the MME in the authentication and authorization reply message, in the identifier of the P-GW in the APN configuration parameter corresponding to the target APN.
  • the authentication and authorization reply message includes the APN configuration parameter and the PGW ID-MME, where the APN configuration parameter includes the target APN and the identifier of the P-GW (in the subscription data of the UE)
  • the MME may define a new parameter PGW ID-MME for indicating the identifier of the P-GW selected by the MME in the APN configuration parameter, where the MME may define a new parameter PGW ID-MME indicating the identifier of the P-GW selected by the MME.
  • the authentication and authorization reply message includes the APN configuration parameter, where the APN configuration parameter includes an identifier of the target APN and a P-GW (the P-GW corresponding to the target APN in the subscription data of the UE) And the PGW ID-MME; wherein the value of the PGW ID-MME is an identifier of the P-GW selected by the MME.
  • the ePDG selects a target P-GW from the P-GW selected by the MME and the identifier of the P-GW in the APN configuration parameter corresponding to the target APN according to the request type of the UE.
  • the ePDG determines that the UE is an EPC accessed through an initial attach procedure, the ePDG uses the P-GW selected by the MME as the target P-GW; if the ePDG determines If the UE is an EPC accessed through a handover procedure or a multiple access procedure, the ePDG The identifier of the P-GW in the APN configuration parameter corresponding to the target APN is used as the target P-GW.
  • the ePDG establishes a PDN connection with the target P-GW for the target APN.
  • the ePDG may notify the MME that the PDN connection is successfully established, and may send the identifier of the target P-GW to the MME in the foregoing message.
  • S613 is an optional step, and the MME may determine the target P-GW by determining a request type of the UE, and does not need to obtain from the ePDG. It is determined whether the UE is an initial attaching process, and the discriminating scheme is as described in the foregoing S502. If yes, the target PGW ID is registered to the HSS via S614-S615.
  • S614 The MME sends a notification request message to the HSS, where the notification request message includes an identifier of the target P-GW to register an identifier of the target P-GW to the HSS.
  • S615 The HSS returns a Notify Response message to the MME.
  • S613-S615 is an optional step, and the MME may also not register the identifier of the target P-GW to the HSS.
  • the embodiment of the present invention provides a mobility management network element 70, which integrates some/all logical functions of the 3GPP AAA Server into the mobility management network element 70.
  • the mobility management network element 70 may include a receiving unit 701, a determining unit 702, a selecting unit 703, and a sending unit 704;
  • the receiving unit 701 is configured to receive a request message sent by the non-3GPP access gateway after the user equipment UE accesses the EPC from the non-3GPP network. Since some or all of the logical functions of the 3GPP AAA Server are integrated into the mobility management network element, the receiving unit 701 can receive a request message from the non-3GPP network, such as receiving the authentication sent by the non-3GPP access gateway. With the authorization request message.
  • the determining unit 702 is configured to determine a request type of the UE, where the request type includes the EPC accessed through an initial attach procedure, the EPC accessed through a handover procedure, or accessed through a multiple access procedure.
  • the determining unit 702 can determine the request type by: Determining the request type by determining whether a context corresponding to the target APN of the UE exists in the mobility management network element; or: the request message includes information about the request type or the request type Determining, by the request message, the request type; or receiving the request type or the request type information sent by the non-3GPP access gateway.
  • the information of the request type may be information generated according to the request type, so that the mobility management network element may determine the request type of the UE according to the information of the request type.
  • the selecting, by the selecting unit 703, the target P-GW according to the target APN may include: the selecting unit 703 selecting a target P-GW according to the identifier of the target APN and the non-3GPP access gateway; or The selecting unit 703 selects a target P-GW according to a protocol IP address that is interconnected between the target APN and the local network of the UE, where the local IP address of the UE is the non-3GPP access network. The IP address assigned by the UE.
  • the sending unit 704 is configured to: return, according to the request message, a response message to the non-3GPP access gateway, where the response message includes the target APN and the identifier of the target P-GW. For example, if the APN configuration parameter corresponding to the target APN in the subscription data of the UE does not include the identifier of the P-GW, the sending unit 704 may add the target P to the APN configuration parameter corresponding to the target APN.
  • the mobility management network element supports an authentication and authorization function of the non-3GPP access network.
  • the mobility management network element may not register the identifier of the target P-GW to the HSS, and may also ensure that the UE uses the same P-GW when switching between the 3GPP network and the non-3GPP network. .
  • the mobility management network element may further register the identifier of the target P-GW to the HSS, where the sending unit 704 is further configured to: after returning the response message to the non-3GPP access gateway,
  • the home subscriber server HSS sends a notification message, where the notification message includes the identifier of the target APN and the target P-GW, and the process of registering the identifier of the P-GW to the HSS in the prior art is required to require the P-GW and the 3GPP.
  • the S6b interface is supported between AAA servers.
  • the mobility management network element may also register the identifier of the P-GW to the HSS only when the PDN is successfully established.
  • the determining unit 702 is further configured to determine, after the sending unit 704 sends the notification message to the HSS, the group between the non-3GPP access gateway established by the target APN and the target P-GW. The data network PDN was successfully established.
  • the target P-GW is selected by the mobility management network element for the UE for the UE accessing from the 3GPP network, and the P of the embodiment of the present invention is used for the UE accessing the non-3GPP network.
  • the target P-GW is selected by the mobility management network element for the UE, but the mechanism for selecting the target P-GW is different for UEs accessing from the 3GPP network and UEs accessing from the non-3GPP network . Therefore, the determining unit 702 is further configured to determine that the UE accesses the EPC from a non-3GPP network before determining a request type of the UE. It is ensured that the P-GW selection scheme in the embodiment of the present invention is adopted only for the UE that is not accessed by the 3GPP.
  • the embodiment of the present invention provides an access gateway 80.
  • the access gateway 80 is an access gateway of a non-3GPP network, such as ePDG, TWAN Or the HSGW, the access gateway 80 may include a sending unit 801, a receiving unit 802, and an establishing unit 803;
  • the sending unit 801 is configured to send a request message to the mobility management network element after the user equipment UE accesses the EPC from the non-3GPP network.
  • part or all of the logical functions of the 3GPP AAA Server are integrated into the mobility management network element, so that the access gateway 80 can directly perform signaling interaction with the mobility management network element.
  • the mobility management network element supports an authentication and authorization function of the non-3GPP access network.
  • the receiving unit 802 is configured to receive a response message that is sent by the mobility management network element according to the request message, where the response message includes a target APN of the UE and a target P-GW selected for the target APN. logo.
  • the establishing unit 803 is configured to establish, according to the identifier of the target APN and the target P-GW, a PDN connection between the access gateway and the target P-GW for the target APN.
  • the access gateway further includes:
  • the sending unit 801 is further configured to: after the PDN connection is successfully established, send a notification message to the mobility management network element, where the notification message includes indication information used to indicate that the PDN connection is successfully established. . Therefore, the mobility management network element may determine that the PDN connection is successfully established according to the notification message.
  • the sending unit is further configured to select the mobility management network element before sending the request message to the mobility management network element.
  • the mobility management network element is selected according to the pre-configuration information; wherein the pre-configuration information includes location information of the UE and an identifier of the mobility management network element. Corresponding relationship, or the pre-configuration information includes a correspondence between the identifier of the non-3GPP access gateway and the identifier of the mobility management network element;
  • IMSI International Mobile Subscriber Identity
  • the non-3GPP access gateway constructs a fully qualified domain name of the mobility management network element according to the location information of the UE, and sends the fully qualified domain name to the domain name resolution server DNS, and the receiving the DNS is determined according to the fully qualified domain name.
  • the identifier of the mobility management network element selects a mobility management network element from the mobility management network element determined by the DNS as the mobility management network element.
  • part or all of the logical functions of the 3GPP AAA Server are integrated into the mobility management network element, which simplifies the network architecture, so that the sending unit 801 of the access gateway can send a request message to the mobility management network element.
  • the receiving unit 802 may receive a response message of the request message, where the response message includes an identifier of the target APN of the UE and a target P-GW selected for the target APN, so that the establishing unit 803 may be configured according to the The identifier of the target APN and the target P-GW establishes a PDN connection between the access gateway and the target P-GW, and adapts to a simplified network architecture to implement P-GW selection.
  • the embodiment of the present invention provides a mobility management network element 90, which integrates some/all logical functions of the 3GPP AAA Server into the mobility management network element 90.
  • the mobility management network element 90 may include a receiving unit 901, a selecting unit 902, an obtaining unit 903, and a sending unit 904;
  • the receiving unit 901 is configured to receive a request message sent by the non-3GPP access gateway after the user equipment UE accesses the evolved packet core network EPC from the non-3GPP network.
  • the selecting unit 902 is configured to select a P-GW according to the target APN of the UE.
  • the selecting unit 902 may determine the target APN of the UE before selecting the target P-GW.
  • the selecting unit 902 may select a target P-GW according to the target APN when selecting a P-GW according to the target APN of the UE.
  • the MME may send a target APN to a DNS server, where the DNS server Returning to the MME a P-GW list (PGW list or P-GW) capable of connecting to the target APN List), the MME may select an appropriate P-GW from the list of P-GWs.
  • P-GW list P-GW list or P-GW
  • the selecting unit 902 may further select a target P-GW according to the identifiers of the target APN and the non-3GPP access gateway; or select a target P-GW according to the target APN and a local IP address of the UE. And thus selecting a P-GW closer to the UE, wherein the local IP address of the UE is an IP address allocated by the non-3GPP access network to the UE.
  • the acquiring unit 903 is configured to obtain an identifier of the P-GW in the APN configuration parameter corresponding to the target APN in the subscription data of the UE.
  • the sending unit 904 is configured to: return, according to the request message, a response message to the non-3GPP access gateway, where the response message includes a target APN of the UE, and a P- selected by the mobility management network element.
  • An identifier of the GW and an identifier of the P-GW in the APN configuration parameter corresponding to the target APN so that the non-3GPP access gateway selects the P-GW from the mobility management network element and the APN corresponding to the target APN
  • the target P-GW is selected for the target APN in the P-GW in the configuration parameter.
  • the request message may be an authentication and authorization request message sent by the non-3GPP access gateway; and the response message may be an authentication and authorization reply message.
  • the mobility management network element supports an authentication and authorization function of the non-3GPP access network.
  • the sending by the sending unit 904, the returning the response message to the non-3GPP access gateway according to the request message, the sending unit 904 adding, in the response message, the mobility management network The first parameter of the identifier of the P-GW selected by the element, and the response message is sent to the non-3GPP access gateway, where the response message includes an APN configuration parameter corresponding to the target APN and the first parameter;
  • the sending unit 904 adds a second parameter for indicating an identifier of the P-GW selected by the mobility management network element to the APN configuration parameter corresponding to the target APN, and sends the second parameter to the non-3GPP access gateway.
  • the response message includes an APN configuration parameter corresponding to the target APN, and the APN configuration parameter corresponding to the target APN includes the second parameter.
  • the MPLS network architecture is used.
  • the identifier of the P-GW may not be registered to the HSS, and the same P-GW may be used by the 3GPP network and the non-3GPP network.
  • the identifier of the P-GW may be registered to the HSS, and the existing HSS network element is not modified.
  • the receiving unit 901 is further configured to receive the identifier sent by the non-3GPP access gateway. aims The identifier of the P-GW is further configured to send a notification message to the home subscriber server HSS, where the notification message includes the identifier of the target APN and the target P-GW.
  • the selecting unit 902 may further determine a request type of the UE, according to the request type of the UE, from a P-GW selected by the mobility management network element and an APN configuration parameter corresponding to the target APN.
  • the sending unit 904 is further configured to send a notification message to the home subscriber server HSS, where the notification message includes the identifier of the target APN and the target P-GW.
  • the selecting unit 902 may further determine that the UE accesses the EPC from a non-3GPP network before selecting the P-GW according to the APN of the UE. Thereby, it is ensured that the selection scheme of the P-GW according to the present invention is adopted for the UE from the non-3GPP access.
  • part or all of the logical functions of the 3GPP AAA Server are integrated into the mobility management network element, which simplifies the network architecture.
  • the receiving unit 901 of the mobility management network element can receive the request message sent by the non-3GPP access gateway, and the selecting unit 902 can select the P-GW for the UE accessed from the non-3GPP network, and the sending unit 904 can Returning, to the non-3GPP access gateway, a response message including the target APN of the UE, the identifier of the P-GW selected by the mobility management network element, and the identifier of the P-GW in the APN configuration parameter corresponding to the target APN, The non-3GPP access gateway selects the P-GW from the P-GW selected by the mobility management network element and the P-GW in the APN configuration parameter corresponding to the target APN according to the request type of the UE, thereby adapting
  • the simplified network architecture enables the choice of P-GW.
  • the sending unit 1001 is configured to send a request message to the mobility management network element after the user equipment UE accesses the EPC from the non-3GPP network, for example, send an authentication and authorization request message to the mobility management network element.
  • the mobility management network element supports an authentication and authorization function of the non-3GPP access network.
  • the receiving unit 1002 is configured to receive a response message that is sent by the mobility management network element according to the request message, where the response message includes a target APN of the UE, and the mobility management network element.
  • the response message may be an authentication and an authorization reply message.
  • the selecting unit 1003 is configured to: according to the request type of the UE, the P-GW selected by the mobility management network element and the P-GW in the APN configuration parameter corresponding to the target APN as the UE.
  • the target APN selects a target P-GW; wherein the request type includes the EPC accessed through an initial attach procedure, the EPC accessed through a handover procedure, or the EPC accessed through a multiple access procedure.
  • the establishing unit 1004 is configured to establish, according to the identifier of the target APN and the target P-GW, a PDN connection between the access gateway and the target P-GW for the target APN.
  • the sending unit 1001 may further send the identifier of the target P-GW to the mobility management network element, so that the mobility management network element may obtain the identifier of the target P-GW, and Registering the identity of the target P-GW to the HSS. Further, the sending unit 1001 may further send the identifier of the target P-GW to the mobility management network element only if the PDN connection is successfully established.
  • part or all of the logical functions of the 3GPP AAA Server are integrated into the mobility management network element, which simplifies the network architecture.
  • the transmitting unit 1001 of the access gateway of the non-3GPP network may send a request message to the mobility management network element, and the receiving unit 1002 may receive the target APN including the UE returned by the mobility management network element,
  • the response message of the P-GW selected by the mobility management network element and the identifier of the P-GW in the APN configuration parameter corresponding to the target APN is selected by the selecting unit 1003 according to the request type of the UE.
  • the device embodiments of the foregoing FIG. 7 to FIG. 10 can also refer to the method embodiments of FIG. 3 to FIG. 6. For example, how to determine the target APN of the UE, how to select the target P-GW, and the like are not described herein.
  • FIG. 11 is an apparatus for P-GW selection according to an embodiment of the present invention, where the apparatus may include:
  • the processor 1101, the memory 1102, and the communication interface 1105 are connected by a bus 1104 and complete communication with each other.
  • Memory 1102 is used by computer to execute instructions 1103. Specifically, the program code may be included in the computer execution instruction 1103.
  • the processor 1101 runs the computer execution instruction 1103, and may execute the method flow of the P-GW selection described in the method embodiment corresponding to any one of FIG. 3 to FIG.
  • the device may be a mobility management network element, such as an MME or an SGSN; when performing the non-3GPP gateway in FIG. 3 to FIG. Or the step of the ePDG, the device may be an access gateway of a non-3GPP network, such as an ePDG or a TWAN or an HSGW.
  • the embodiment of the present invention provides a computer readable medium, including a computer executing instruction, when the processor of the computer executes the computer execution instruction, the computer performs the method embodiment corresponding to any one of FIG. 3 to FIG. The method of P-GW selection.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • the technical solution of the present invention contributes in essence or to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium.
  • a number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division, and the actual implementation may have another
  • the manner of division, such as multiple units or components, may be combined or integrated into another system, or some features may be omitted or not performed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, or an electrical, mechanical or other form of connection.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.

Abstract

本发明实施例提供了一种分组数据网关的选择方法，相关装置及系统，能够将3GPP AAA Server的部分/全部的逻辑功能融合到移动性管理网元中，针对从非3GPP侧接入的UE，由移动性管理网元，或者由移动性管理网元和非3GPP接入网关实现目标P-GW的选择，不仅简化了网络架构，而且能够适应简化的网络架构实现P-GW的选择。

Description

一种分组数据网关的选择方法、相关装置及系统 技术领域
本发明涉及通信技术领域，具体涉及一种分组数据网关的方法、相关装置及系统。
背景技术
为了应对无线宽带技术的挑战，保持第三代伙伴计划(3rd Generation Partnership Project，3GPP)网络的领先优势，3GPP在2004年底制定了移动通信网络的长期演进(Long Term Evolution，LTE)计划，在此演进计划的指导下，定义了新的移动通信网络架构，如图1所示。该架构比第二代(Second Generation，2G)网络和第三代(Third Generation，3G)网络更加扁平化，并且只保留了分组交换(Packet Switching，PS)域，因此可以称为演进的3GPP分组交换域(Evolved 3GPP Packet Switched Domain)，也可称之为演进的分组系统(Evolved Packet System，EPS)。
该新的移动通信网络的核心网即演进的分组核心网(Evolved Packet Core Network，EPC)不但支持3GPP接入技术，还支持非3GPP(Non 3GPP)接入技术，如码分多址2000(Code Division Multiple Access 2000，CDMA2000)、全球微波互联接入(Worldwide Interoperability for Microwave Access，WiMAX)和无线局域网络(Wireless Local Area Networks，WLAN)。
在现有网络架构下(如图1所示)，用户设备(User Equipment，UE)从非3GPP侧接入EPC时，可以从可信的非3GPP侧接入，还可以从非可信的3GPP侧接入。以UE从非可信的3GPP侧接入(如UE从非可信WLAN接入)为例，演进的分组数据网关(Evolved Packet Data Gateway，ePDG)首先根据UE是通过初始附着(initial attach)流程、多接入(multiple access)流程还是切换(handover)流程接入的，采用相应地P-GW选择机制来选择分组数据网关(Packet Data Network Gateway，P-GW)，并向上述选择的P-GW发起分组数据网(Packet Data Network，PDN)连接建立流程；该P-GW需要将P-GW 的标识(即P-GW ID)通过自身与3GPP鉴权、授权及计费服务器(3GPP Authentication,Authorization,and Accounting Server，3GPP AAA Server)之间的S6b接口发送给3GPP AAA Server；3GPP AAA Server再将收到的P-GW标识注册到归属用户服务器(home subscriber server/system，HSS)。至此，完成P-GW的选择到注册的流程。
然而，现有技术中，将P-GW的标识注册到HSS的过程需要P-GW与3GPP AAA Server之间支持S6b接口。但后续网络部署时，运营商希望尽量简化网络架构，例如不再部署S6b接口或者不再单独部署3GPP AAA Server。这样基于现有方案将无法实现P-GW ID到HSS的注册，甚至无法实现P-GW的选择，进而无法保证UE从Non 3GPP侧到3GPP侧移动时的业务连续性，影响用户体验。
发明内容
针对现有技术的上述问题，本发明实施例提供一种分组数据网关的选择方法、相关装置及系统，能够适应新的简化的网络架构，实现分组数据网关的选择。
第一方面，本发明实施例提供了一种分组数据网关P-GW的选择方法，包括：
在UE从非3GPP网络接入到EPC之后，移动性管理网元接收非3GPP接入网关发送的请求消息；
所述移动性管理网元确定所述UE的请求类型，所述请求类型包括通过初始附着流程接入的所述EPC、通过切换流程接入的所述EPC或者通过多接入流程接入的所述EPC；
所述移动性管理网元根据所述请求类型，为所述UE的目标接入点名称APN选择目标P-GW；
所述移动性管理网元根据所述请求消息，向所述非3GPP接入网关返回响应消息，所述响应消息中包含所述目标APN以及所述目标P-GW的标识。
结合第一方面，在第一种可能的实现方式中，所述移动性管理网元根据所述请求类型，为所述UE的目标接入点名称APN选择目标P-GW之前，还包括： 所述移动性管理网元确定所述UE的目标APN。
结合第一方面或者第一方面的第一种可能的实现方式，在第二种可能的实现方式中，所述移动性管理网元确定所述UE的请求类型之前，还包括：所述移动性管理网元确定所述UE是从非3GPP网络接入所述EPC的。
结合第一方面或者第一方面的第一种或者第二种可能的实现方式，在第三种可能的实现方式中，所述移动性管理网元根据所述请求消息，向所述非3GPP接入网关返回响应消息，所述响应消息中包含所述目标APN以及所述目标P-GW的标识，包括：
若所述UE的签约数据中所述目标APN对应的APN配置参数不包含P-GW的标识，则在所述目标APN对应的APN配置参数中增加所述目标P-GW的标识；若所述目标APN对应的APN配置参数中包含的P-GW的标识不是所述目标P-GW的标识，则所述移动性管理网元将所述目标APN对应的APN配置参数中的P-GW的标识替换为所述目标P-GW的标识；所述移动性管理网元向所述非3GPP接入网关发送所述响应消息，所述响应消息中包含所述目标APN对应的APN配置参数，所述目标APN对应的APN配置参数中包含所述目标APN和所述目标P-GW的标识。
第二方面，本发明实施例提出了一种分组数据网关P-GW的选择方法，包括：
在用户设备UE从非第三代伙伴计划3GPP网络接入到演进分组核心网EPC之后，非3GPP接入网关向移动性管理网元发送请求消息；
所述非3GPP接入网关接收所述移动性管理网元根据所述请求消息发送的响应消息，所述响应消息中包含所述UE的目标接入点名称APN和为所述目标APN选择的目标P-GW的标识；
所述非3GPP接入网关根据所述目标APN和所述目标P-GW的标识，为所述目标APN建立所述非3GPP接入网关与所述目标P-GW之间的分组数据网PDN连接。
结合第二方面，在第一种可能的实现方式中，所述非3GPP接入网关向移动性管理网元发送请求消息之前，所述方法还包括：所述非3GPP接入网关选 择所述移动性管理网元。
结合第二方面的第一种可能的实现方式，在第二种可能的实现方式中，所述方法还包括：
所述非3GPP接入网关根据预配置信息，选择所述移动性管理网元；其中，所述预配置信息包含所述UE的位置信息与所述移动性管理网元的标识的对应关系，或者所述预配置信息包含所述非3GPP接入网关的标识与所述移动性管理网元的标识的对应关系；
或者，
所述非3GPP接入网关将所述UE的国际移动用户识别码IMSI发送给路由代理节点，以便所述路由代理节点根据所述UE的IMSI为所述UE选择所述移动性管理网元；
或者，
所述非3GPP接入网关根据所述UE的位置信息构造移动性管理网元的完全合格域名，并将所述完全合格域名发送给域名解析服务器DNS，接收所述DNS根据所述完全合格域名确定的移动性管理网元的标识，从所述DNS确定的移动性管理网元中选择移动性管理网元作为所述移动性管理网元。
第三方面，本发明实施例提供了一种分组数据网关P-GW的选择方法，包括：在用户设备UE从非第三代伙伴计划3GPP网络接入到演进分组核心网EPC之后，移动性管理网元接收非3GPP接入网关发送的请求消息；
所述移动性管理网元根据所述UE的目标接入点名称APN选择P-GW；
所述移动性管理网元获取所述UE的签约数据中所述目标APN对应的APN配置参数中的P-GW的标识；
所述移动性管理网元根据所述请求消息，向所述非3GPP接入网关返回响应消息，所述响应消息中包含所述UE的目标APN、所述移动性管理网元选择的P-GW的标识和所述目标APN对应的APN配置参数中的P-GW的标识，以便所述非3GPP接入网关从所述移动性管理网元选择的P-GW和所述目标APN对应的APN配置参数中的P-GW中为所述目标APN选择目标P-GW。
结合第三方面，在第一种可能的实现方式中，所述移动性管理网元根据所 述UE的目标接入点名称APN选择P-GW之前，所述方法还包括：所述移动性管理网元确定所述UE的目标APN。
结合第三方面，或者第三方面的第一种可能的实现方式，在第二种可能的实现方式中，所述移动性管理网元根据所述UE的目标接入点名称APN选择P-GW之前，所述方法还包括：所述移动性管理网元确定所述UE是从非3GPP网络接入所述EPC的。
第四方面，本发明实施例提出了一种分组数据网关P-GW的注册方法，包括：
在用户设备UE从非第三代伙伴计划3GPP网络接入到演进分组核心网EPC之后，非3GPP接入网关向移动性管理网元发送请求消息；
所述非3GPP接入网关接收所述移动性管理网元根据所述请求消息发送的响应消息，所述响应消息中包含所述UE的目标接入点名称APN、所述移动性管理网元选择的P-GW的标识和所述UE的签约数据中所述目标APN对应的APN配置参数中的P-GW的标识；
所述非3GPP接入网关根据所述UE的请求类型，从所述移动性管理网元选择的P-GW和所述目标APN对应的APN配置参数中的P-GW中为所述UE的目标APN选择目标P-GW；其中，所述请求类型包括通过初始附着流程接入的所述EPC、通过切换流程接入的所述EPC或者通过多接入流程接入的所述EPC；
所述非3GPP接入网关根据所述目标APN和所述目标P-GW的标识，为所述目标APN建立所述非3GPP接入网关与所述目标P-GW之间的分组数据网络PDN连接。
结合第四方面，在第一种可能的实现方式中，所述非3GPP接入网关向移动性管理网元发送请求消息之前，所述方法还包括：所述非3GPP接入网关选择所述移动性管理网元。
结合第四方面的第一种可能的实现方式，在第二种可能的实现方式中，所述方法还包括：
所述非3GPP接入网关根据预配置信息，选择所述移动性管理网元；其中，所述预配置信息包含所述UE的位置信息与所述移动性管理网元的标识的对应 关系，或者所述预配置信息包含所述非3GPP接入网关的标识与所述移动性管理网元的标识的对应关系；
或者，
所述非3GPP接入网关将所述UE的国际移动用户识别码IMSI发送给路由代理节点，以便所述路由代理节点根据所述UE的IMSI为所述UE选择所述移动性管理网元；
或者，
所述非3GPP接入网关根据所述UE的位置信息构造移动性管理网元的完全合格域名，并将所述完全合格域名发送给域名解析服务器DNS，接收所述DNS根据所述完全合格域名确定的移动性管理网元的标识，从所述DNS确定的移动性管理网元中选择移动性管理网元作为所述移动性管理网元。
第五方面，本发明实施例提供了一种移动性管理网元，包括：
接收单元，用于在用户设备UE从非第三代伙伴计划3GPP网络接入到演进分组核心网EPC之后，接收非3GPP接入网关发送的请求消息；
确定单元，用于确定所述UE的请求类型，所述请求类型包括通过初始附着流程接入的所述EPC、通过切换流程接入的所述EPC或者通过多接入流程接入的所述EPC；
选择单元，用于根据所述请求类型，为所述UE的目标接入点名称APN选择目标P-GW；
发送单元，用于根据所述请求消息，向所述非3GPP接入网关返回响应消息，所述响应消息中包含所述目标APN以及所述目标P-GW的标识。
第六方面，本发明实施例提供了一种接入网关，其特征在于，所述接入网关为非第三代伙伴计划3GPP网络的接入网关，所述接入网关包括：
发送单元，用于在用户设备UE从所述非3GPP网络接入到演进分组核心网EPC之后，向移动性管理网元发送请求消息；
接收单元，用于接收所述移动性管理网元根据所述请求消息发送的响应消息，所述响应消息中包含所述UE的目标接入点名称APN和为所述目标APN选择的目标P-GW的标识；
建立单元，用于根据所述目标APN和所述目标P-GW的标识，为所述目标APN建立所述接入网关与所述目标P-GW之间的分组数据网PDN连接。
结合第六方面，在第一种可能的实现方式中，所述发送单元还用于，在向移动性管理网元发送请求消息之前，选择所述移动性管理网元。
第七方面，本发明实施例提供了一种移动性管理网元，包括：
接收单元，用于在用户设备UE从非第三代伙伴计划3GPP网络接入到演进分组核心网EPC之后，接收非3GPP接入网关发送的请求消息；
选择单元，用于根据所述UE的目标接入点名称APN选择P-GW；
获取单元，获取所述UE的签约数据中所述目标APN对应的APN配置参数中的P-GW的标识；
发送单元，用于根据所述请求消息，向所述非3GPP接入网关返回响应消息，所述响应消息中包含所述UE的目标APN、所述移动性管理网元选择的P-GW的标识和所述目标APN对应的APN配置参数中的P-GW的标识，以便所述非3GPP接入网关从所述移动性管理网元选择的P-GW和所述目标APN对应的APN配置参数中的P-GW中为所述目标APN选择目标P-GW。
第八方面，本发明实施例提供了一种接入网关，所述接入网关为非第三代伙伴计划3GPP网络的接入网关，所述接入网关包括：
发送单元，用于在用户设备UE从所述非3GPP网络接入到演进分组核心网EPC之后，向移动性管理网元发送请求消息；
接收单元，用于接收所述移动性管理网元根据所述请求消息发送的响应消息，所述响应消息中包含所述UE的目标接入点名称APN、所述移动性管理网元选择的P-GW的标识和所述UE的签约数据中所述目标APN对应的APN配置参数中的P-GW的标识；
选择单元，用于根据所述UE的请求类型，从所述移动性管理网元选择的P-GW和所述目标APN对应的APN配置参数中的P-GW中为所述UE的目标APN选择目标P-GW；其中，所述请求类型包括通过初始附着流程接入的所述EPC、通过切换流程接入的所述EPC或者通过多接入流程接入的所述EPC；
建立单元，用于根据所述目标APN和所述目标P-GW的标识，为所述目标 APN建立所述接入网关与所述目标P-GW之间的分组数据网络PDN连接。
结合第八方面，在第一种可能的实现方式中，所述发送单元还用于，在向移动性管理网元发送请求消息之前，选择所述移动性管理网元。
结合上述任一方面或者任一方面的任一可能的实现方式，所述请求消息为所述非3GPP接入网关发送的鉴权与授权请求消息；所述响应消息为鉴权与授权回复消息。
结合上述任一方面或者任一方面的任一可能的实现方式，所述移动性管理网元支持非3GPP接入网的鉴权与授权功能。
在本发明各实施例中，移动性管理网元支持非3GPP接入网的鉴权授权功能是指该移动性管理网元能够对从所述非3GPP接入网(如WLAN、CDMA2000或者WiMAX)接入的UE进行鉴权与授权。
本发明实施例中，将3GPP AAA Server的部分/全部的逻辑功能融合到移动性管理网元中，由移动性管理网元，或者由移动性管理网元和非3GPP接入网关实现非3GPP侧的P-GW的选择，不仅简化了网络架构，而且能够适应简化的网络架构实现P-GW的选择。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是一种演进的分组系统的系统架构示意图；
图2(a)是本发明实施例提供的一种3GPP AAA Server与MME融合的架构的示意图；
图2(b)是本发明实施例提供的一种3GPP AAA Server与SGSN融合的架构的示意图；
图3是本发明实施例提供的一种分组数据网关选择的方法流程图；
图4是本发明实施例提供的又一种分组数据网关选择的方法流程图；
图5是本发明实施例提供的又一种分组数据网关选择的方法流程图；
图6是本发明实施例提供的又一种分组数据网关选择的方法流程图；
图7是本发明实施例提供的一种移动性管理网元的示意图；
图8是本发明实施例提供的一种接入网关的示意图；
图9是本发明实施例提供的又一种移动性管理网元的示意图；
图10是本发明实施例提供的又一种接入网关的示意图；
图11是本发明实施例提供的一种P-GW选择的装置的组成结构示意图。
具体实施方式
本发明实施例提供一种分组数据网关的选择方法，能够基于简化的网络架构，实现分组数据网关的选择，本发明实施例还提供了相应的设备及系统。
如图1所示，在现有的网络架构下，核心网EPC主要包括移动性管理实体(Mobility Management Entity，MME)、通用分组无线系统(General Packet Radio Service，GPRS)业务支持节点(Serving GPRS Support Node，SGSN)、服务网关(Serving Gateway,S-GW)和P-GW；其中，MME是主要负责与用户设备之间的非接入层(Non-Access Stratum，NAS)信令，为用户设备分配临时身份标识，为3GPP接入的用户设备选择S-GW和P-GW等核心网网元；S-GW是本地eNodeB之间切换的移动性锚点，并提供合法监听相关功能；P-GW主要负责用户地址分配、策略控制和计费规则的执行和以及合法监听相关功能。
当UE从非3GPP网络接入EPC时，UE可以通过可信非3GPP接入网与P-GW之间的接口接入，例如通过可信WLAN接入网络(trusted WLAN access network，TWAN)与P-GW之间的S2a接口接入，还可以通过非可信非3GPP接入网与P-GW之间的接口接入，例如通过ePDG与P-GW之间的S2b接口接入，其中，ePDG/TWAN主要负责转发P-GW分配的UE的移动网络之间互连的协议(Internet Protocol，IP)地址，注册UE的本地IP地址，并将UE的移动IP地址和本地IP地址进行绑定。从非3GPP网络接入时，还有一个重要网元是3GPP AAA server，主要负责通过与HSS的交互实现对UE的鉴权授权操作，以及将UE建立的每个PDN连接所用的P-GW标识信息注册到HSS中，而HSS主要用于存储用户的签约信息。
由于后续网络部署时，运营商希望尽量简化网络架构，例如不再部署S6b接口或者不再单独部署3GPP AAA Server而将其功能与现有EPC网元相融合，这样利用现有技术将无法实现P-GW ID到HSS的注册，甚至无法实现P-GW的选择，从而无法保证UE从Non 3GPP侧到3GPP侧移动时的业务连续性。有鉴于此，本发明实施例提供了一种P-GW的选择方法，能够将3GPP AAA Server的部分/全部的逻辑功能融合到移动性管理网元中，由移动性管理网元或者由移动性管理网元和非3GPP接入网关共同实现非3GPP侧的P-GW的选择，不仅简化了网络架构，而且在不再部署S6b接口或者不再单独部署3GPP AAA Server的情况下，也能够实现P-GW的选择和注册。
在本发明实施例中，移动性管理网元可以是MME，还可以是SGSN(如GnGp-SGSN或者S4-SGSN)；非3GPP接入网关，即非3GPP网络的接入网关，可以是ePDG，还可以是TWAN或者高速分组数据(High Rate Packet Data，HRPD)服务网关(HRPD Serving Gateway，HSGW)，本发明实施例在此不作限定。
在本发明实施例中，以移动性管理网元为MME，非3GPP接入网关为ePDG为例，提出了一种3GPP AAA Server与MME融合的架构图，如图2(a)所示。将3GPP AAA Server的逻辑功能部署到MME，将MME与HSS之间的S6a接口升级支持3GPP AAA Server与HSS之间的SWx接口或者在MME与HSS之间增加独立的SWx接口，ePDG与3GPP AAA Server之间的SWm接口可以部署在MME于ePDG之间，ePDG与3GPP AAA Server之间的S6b接口不再部署，3GPP AAA Server与非可信的3GPP接入网之间的SWa接口也可以不再部署，大大简化了网络架构。
同理，也可以将MME换成SGSN，即将3GPP AAA Server的逻辑功能部署到SGSN，相应地，将MME与HSS之间的S6a接口换成SGSN与HSS之间的S6d接口或者Gr接口(如果支持MAP协议)，将MME与S-GW之间的S11接口换成SGSN与S-GW之间的S4即可，如图2(b)示出了一种3GPP AAA Server与SGSN融合的架构图。
可选地，也可以将ePDG换成TWAN/HSGW，相应地，将ePDG与 MME/SGSN之间的SWm接口换成TWAG/HSGW与MME/SGSN之间的STa接口，将ePDG与P-GW之间的S2b接口换成TWAN/HSGW与P-GW之间的S2a接口即可，图中未示出，则TWAN/HSGW与3GPP AAA Server之间的S6b接口不再部署，3GPP AAA Server与可信的3GPP接入网之间的SWa接口也可以不再部署，大大简化了网络架构。
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述。
如图3所示，本发明实施例提供了一种分组数据网关P-GW的选择方法，可以将3GPP AAA Server的部分/全部的逻辑功能融合到移动性管理网元中，利用移动性管理网元实现P-GW的选择，具体方法如下。
S301：在UE从非3GPP网络接入到EPC之后，移动性管理网元接非3GPP接入网关发送的请求消息。
通常情况下，移动性管理网元只能接收3GPP网络发送的消息。而在本发明实施例中，由于将3GPP AAA Server的部分/全部的逻辑功能融合到了移动性管理网元中，例如如图2(a)或图2(b)所示，因而移动性管理网元可以收到非3GPP接入网关(即所述非3GPP网络的接入网关)发送的请求消息，如鉴权与授权请求(Authentication and Authorization Request)消息。
在3GPP AAA Server与移动性管理网元融合的架构下，可以在移动性管理网元与非3GPP接入网关之间增加接口以进行消息/信令交互，如SWm接口或者STa接口，则所述请求消息以及后续所述请求消息的响应消息可以通过移动性管理网元与非3GPP接入网关之间增加的接口进行传输。
S302：所述移动性管理网元确定所述UE的请求类型，所述请求类型包括通过初始附着流程接入的所述EPC、通过切换流程接入的所述EPC或者通过多接入流程接入的所述EPC。
所述移动性管理网元在选择目标P-GW时，可以针对所述UE是通过初始附着流程还是切换流程还是多接入流程接入的所述EPC，采用不同的P-GW选择机制。因此，所述MME可以确定所述UE的请求类型，即确定所述UE是通过 初始附着流程或者通过切换流程或者通过接入流程接入的所述EPC。
具体地，所移动性管理网元可以接收非3GPP接入网关发送的所述请求类型或者所述请求类型的信息来确定，也可以自身通过判断自身是否存在该UE的与目标APN对应的上下文来确定，本发明实施例在此不作限定，所述请求类型的信息可以是根据所述请求类型所生成的信息，所述移动性管理网元根据所述请求类型的信息，确定所述UE的请求类型。例如，所述非3GPP接入网关可以确定所述请求类型，并通过所述请求消息或者其它类型消息将所述请求类型或者所述请求类型的信息通知所述移动性管理网元，从而所述移动性管理网元可以确定所述UE的请求类型。又例如，所述移动性管理网元可以利用UE的国际移动用户识别码(International Mobile Subscriber Identification Number，IMSI)与目标APN，判断所述移动性管理网元上是否已经存在所述UE的与所述目标APN对应的上下文，如果存在，则确定所述请求类型为通过切换流程接入的所述EPC或者通过多接入流程接入的所述EPC，否则确定所述请求类型为通过初始附着流程接入的所述EPC。
S303：所述移动性管理网元根据所述请求类型，为所述UE的目标接入点名称APN选择目标P-GW。
所述移动性管理网元在选择目标P-GW之前，可以确定所述UE的目标APN具体地，如果所述UE请求了APN，则所述MME可以将所述UE请求的APN作为目标APN；否则，所述MME可以使用所述UE的签约数据中的缺省APN作为目标APN。
在为所述目标APN选择目标P-GW时，如果所述移动的管理网元确定所述UE为通过初始附着流程接入的所述EPC(即确定所述请求类型为通过初始附着流程接入的所述EPC)时，所述移动性管理网元可以根据所述目标APN选择所述目标P-GW，或者，根据所述目标APN和非3GPP接入网关的标识或者根据所述目标APN和所述UE的本地IP地址选择所述目标P-GW，从而可以选择离所述UE较近的/最近的P-GW作为目标P-GW，其中，所述UE的本地IP地址是指所述非3GPP接入网(如WLAN、CDMA2000或者WiMAX等)为所述UE分配的IP地址。
如果所述移动的管理网元确定所述UE为通过切换流程或多接入流程接入的所述EPC(即确定所述请求类型为通过切换流程或多接入流程接入的所述EPC)时，所述移动性管理网元可以获取所述UE的签约数据中所述目标APN对应的APN配置参数(APN-Configuration，AVP)中的P-GW的标识，即所述UE的签约数据中所述目标APN对应的P-GW的标识，将所述目标APN对应的APN配置参数中的P-GW作为所述目标P-GW。
需要说明的是，在本发明实施例中，S301可以在S302与S303之前执行，也可以在S302与S303之后执行，本发明实施例在此不作限定。
S304：所述移动性管理网元根据所述请求消息，向所述非3GPP接入网关返回响应消息，所述响应消息中包含所述目标APN以及所述目标P-GW的标识。
所述移动性管理网元可以将所述目标APN以及所述目标P-GW的标识通过响应所述请求消息的响应消息发送给非3GPP接入网关，如鉴权与授权回复(Authentication and Authorization Answer)消息，从而节约了信令交互。所述非3GPP接入网关可以根据所述目标APN和所述目标P-GW的标识，为所述目标APN建立所述非3GPP接入网关与所述目标P-GW之间的分组数据网PDN连接。
例如，如果所述移动性管理网元在选择的目标P-GW是所述UE的签约数据中所述目标APN对应的APN配置参数中的P-GW，则所述UE的签约数据中所述目标APN对应的APN配置参数中包含所述目标P-GW的标识和目标APN，否则所述所述目标APN对应的APN配置参数中只包含目标APN不包含所述目标P-GW的标识。从而，在发送所述响应消息时，可以利用所述目标APN对应的APN配置参数。比如，如果所述UE的签约数据中所述目标APN对应的APN配置参数不包含P-GW的标识，则在所述目标APN对应的APN配置参数中增加所述目标P-GW的标识；如果所述目标APN对应的APN配置参数中包含的P-GW的标识不是所述目标P-GW的标识，则所述移动性管理网元将所述目标APN对应的APN配置参数中的P-GW的标识替换为所述目标P-GW的标识；所述移动性管理网元向所述非3GPP接入网关发送响应消息，所述响应消息中包含所述目标APN对应的APN配置参数，所述目标APN对应的APN配置参数中包含所述 目标APN和所述目标P-GW的标识。
本发明实施例中，将3GPP AAA Server的部分/全部的逻辑功能融合到了移动性管理网元中，简化了网络架构，使得移动性管理网元可以接收非3GPP接入网关发送的请求消息，可以为从非3GPP网络接入的UE选择目标P-GW，并向非3GPP接入网返回包含所述UE的目标APN和所述目标P-GW的标识的响应消息，适应了简化的网络架构实现了P-GW的选择。
在本发明实施例中，可以不将所述目标P-GW的标识注册到HSS。这是因为，在现有技术中，必须将所述目标P-GW的标识注册到所述HSS才能保证UE在3GPP网络与非3GPP网络之间切换时使用相同的P-GW。而在本发明中，由于采用了新的简化的网络构架，无论是从3GPP网络接入的UE，还是从非3GPP网络接入的UE，都是由移动性管理网元进行目标P-GW的选择，因此在切换时，可以保证3GPP网络与非3GPP网络使用相同的P-GW，因而也可以不将P-GW注册到HSS。
可选地，也可以将所述目标P-GW的标识注册到HSS完成目标P-GW的选择和注册流程，相应地，所述方法还可以包括：
S305：所述移动性管理网元向归属用户服务器HSS发送通知消息(Notify Request)，所述通知消息包含所述目标APN和所述目标P-GW的标识，以将所述目标P-GW的标识注册到所述HSS。不同于现有技术中将P-GW的标识注册到HSS的过程需要P-GW与3GPP AAA Server之间支持S6b接口，本发明实施例中通过移动性管理网元与HSS之间的接口直接将P-GW的标识注册到HSS。
可选地，所述移动性管理网元也可以只在所述PDN建立成功时，才将所述P-GW的标识注册到HSS。例如，所述非3GPP接入网关可以在所述PDN连接建立成功后，向所述移动性管理网元发送通知消息，所述通知消息包含用于指示所述PDN建立成功的指示信息，则所述MME可以根据所述指示信息，确定所述PDN建立成功，将所述目标P-GW的标识注册到所述HSS。
在上述实施例中，对于通过非3GPP网络接入的UE，由移动性管理网元为 所述UE的目标APN选择目标P-GW，移动性管理网元在选择目标P-GW时，需要判断所述UE的请求类型，对于通过初始附着流程接入的UE，所述移动性管理网元基于所述目标APN选择目标P-GW，对于通过切换流程或者多接入流程接入的UE，是使用所述UE的签约数据中的所述目标APN对应APN配置参数中的P-GW作为目标P-GW。本发明实施例还提出了一种P-GW的选择方法，不同于上一实施例，在本发明实施例中，MME不需要判断UE的请求类型，MME只需确定目标APN，并基于所述目标APN选择P-GW，并将所述MME选择的P-GW的标识、所述目标APN和所述目标APN对应的APN参数中的P-GW的标识发送给非3GPP接入网关，由所述非3GPP接入网关根据所述UE的请求类型，从所述MME选择的P-GW和所述所述目标APN对应的APN配置参数中的P-GW中选择目标P-GW。具体地，所述方法可以如图4所示。
S401：在用户设备UE从非第三代伙伴计划3GPP网络接入到演进分组核心网EPC之后，移动性管理网元接收非3GPP接入网关发送的请求消息。S401可以参考S301，本发明实施例在此不再赘述。
S402：所述移动性管理网元根据所述UE的目标接入点名称APN选择P-GW。
不同于上一实施例，在本发明实施例中所述移动性管理网元无需确定所述UE的接入类型，直接根据目标APN选择P-GW即可，例如所述移动性管理网元可以根据所述目标APN和所述非3GPP接入网关的标识，或者，根据所述目标APN和所述UE的本地IP地址，选择P-GW。
所述移动性管理网元还可以确定所述UE的目标APN，关于如何确定所述目标APN以及如何根据所述目标APN选择P-GW可以参考其它实施例。
S403：所述移动性管理网元获取所述UE的签约数据中所述目标APN对应的APN配置参数中的P-GW的标识。
所述移动性管理网元可以从HSS获取所述UE的签约数据，所述UE的签约数据中包含至少一组APN配置参数，所述APN配置参数中包含APN和其对应的P-GW的标识，如果所述UE为通过初始流程接入，所述P-GW的标识可能是缺省的。所述移动性管理网元可以从所述UE的签约数据中，确定与所述目标APN 对应的APN配置参数，所述目标APN对应的APN配置参数中包含所述目标APN和P-GW的标识。
S404：所述移动性管理网元根据所述请求消息，向所述非3GPP接入网关返回响应消息，所述响应消息中包含所述UE的目标APN、所述移动性管理网元选择的P-GW的标识和所述目标APN对应的APN配置参数中的P-GW的标识。
所述移动性管理网元可以通过所述请求消息的响应消息，如鉴权与授权回复消息，将上述信息发送给所述非3GPP接入网关，以便所述非3GPP接入网关从所述移动性管理网元选择的P-GW和所述目标APN对应的APN配置参数中的P-GW中选择目标P-GW。
S405：所述非3GPP接入网关根据所述UE的请求类型，从所述移动性管理网元选择的P-GW和所述目标APN对应的APN配置参数中的P-GW中选择目标P-GW。
所述非3GPP接入网关可以确定所述UE的请求类型。可选地，如果所述请求类型为通过初始附着流程接入的所述EPC，所述非3GPP接入网关可以选择所述移动性管理网元选择的P-GW为所述目标P-GW。如果所述请求类型为通过切换流程或多接入流程接入的所述EPC，所述非3GPP接入网关可以选择所述目标APN对应的APN配置参数中的P-GW为所述目标P-GW。
S406：所述非3GPP接入网关根据所述目标APN和所述目标P-GW的标识，为所述目标APN建立所述非3GPP接入网关与所述目标P-GW之间的分组数据网络PDN连接。
在本发明实施例中，将3GPP AAA Server的部分/全部的逻辑功能融合到了移动性管理网元中，简化了网络架构。并且基于融合的网络架构，移动性管理网元可以接收非3GPP接入网关发送的请求消息，可以为从非3GPP网络接入的UE选择P-GW，并向非3GPP接入网关返回包含所述UE的目标APN、所述移动性管理网元选择的P-GW的标识以及所述目标APN对应的APN配置参数中的P-GW的标识的响应消息，由非3GPP接入网关根据所述UE的请求类型从所述移动性管理网元选择的P-GW以及所述目标APN对应的APN配置参数中的 P-GW中选择P-GW，从而适应了简化的网络架构实现了P-GW的选择。
可选地，由于采用了融合的网络架构，在本发明实施例中可以不将所述P-GW的标识注册到HSS，也能保证3GPP网络与非3GPP网络使用相同的P-GW。
可选地，可以将所述P-GW的标识注册到HSS，而不对现有的HSS网元做改动，则所述方法还可以包括：
所述移动性管理网元接收所述非3GPP接入网关发送的所述目标P-GW的标识，或者所述移动性管理网元也可以确定所述UE的请求类型，根据所述UE的请求类型，从所述移动性管理网元选择的P-GW和所述目标APN对应的APN配置参数中的P-GW中确定目标P-GW，从而所述移动性管理网元可以向归属用户服务器HSS发送通知消息，所述通知消息包含所述目标APN和所述目标P-GW的标识，以将所述目标P-GW的标识注册到所述HSS；可选地，所述非3GPP接入网关可以在所述PDN连接建立成功后才将所述目标P-GW的标识发送给所述移动性管理网元。
需要说明的是，所述目标APN对应的APN配置参数中原本已经包含了所述目标APN以及与所述目标APN对应的P-GW的标识(即所述UE的签约数据中所述目标APN对应的APN配置参数中P-GW的标识)，因而所述移动性管理网元在将所述UE的目标APN、所述移动性管理网元选择的P-GW的标识和所述目标APN对应的APN配置参数中的P-GW的标识发送给所述非3GPP接入网关时，可以利用所述目标APM对应的APN配置参数。例如，所述移动性管理网元可以在所述响应消息中增加用于指示所述移动性管理网元选择的P-GW的标识的第一参数，并向所述非3GPP接入网关发送所述响应消息，所述响应消息中包含所述目标APN对应的APN配置参数和所述第一参数。又例如，所述移动性管理网元可以在所述目标APN对应的APN配置参数中增加用于指示移动性管理网元选择的P-GW的标识的第二参数，并向所述非3GPP接入网关发送响应消息，所述响应消息中包含所述目标APN对应的APN配置参数，所述目标APN对应的APN配置参数中包含所述第二参数。可选地，所述响应消息可以是鉴权与授权回复消息。
可选地，在本发明实施例中和图3对应的方法实施例中，所述移动性管理网元支持非3GPP接入网的鉴权授权功能。
可选地，在本发明实施例中和图3对应的方法实施例中，所述非3GPP接入网关在向移动性管理网元发送请求消息之前，所述方法还包括：所述非3GPP接入网关选择所述移动性管理网元。例如，所述非3GPP接入网关根据预配置信息，选择所述移动性管理网元；其中，所述预配置信息包含所述UE的位置信息与所述移动性管理网元的标识的对应关系，或者所述预配置信息包含所述非3GPP接入网关的标识与所述移动性管理网元的标识的对应关系；
或者，所述非3GPP接入网关将所述UE的国际移动用户识别码IMSI发送给路由代理节点，以便所述路由代理节点根据所述UE的IMSI为所述UE选择所述移动性管理网元；
或者，所述非3GPP接入网关根据所述UE的位置信息构造移动性管理网元的完全合格域名，并将所述完全合格域名发送给域名解析服务器DNS，接收所述DNS根据所述完全合格域名确定的移动性管理网元的标识，从所述DNS确定的移动性管理网元中选择移动性管理网元作为所述移动性管理网元，从而可以选择离所述UE位置较近的移动性管理网元。
下面以移动性管理网元为MME，非3GPP接入网关为ePDG为例，进行说明，当移动性管理网元为SGSN或者非3GPP接入网关为TWAN/HSGW时，也可以参考如下方法进行P-GW的选择和注册，本发明实施例在此不再赘述。结合图2(a)所述的网络架构，本发明实施例提供了一种P-GW的选择方法，如图5所示。
S501：UE向ePDG发送IKE鉴权请求消息(Internet Key Exchange_Authentication request message，IKE_AUTH request message)。
当UE从非3GPP网络接入EPC时，可以向ePDG发送IKE鉴权请求消息，所述IKE鉴权请求消息中可以包含IP地址，例如，如果所述UE是通过初始附着流程接入到EPC的，则所述IP地址是值为全零的IP地址(IPv4地址或者IPv6地址)； 如果所述UE是通过切换流程接入到EPC，则所述IP地址为所述UE的IP地址，其中，所述UE的IP地址为所述UE接入EPC之前，从3GPP网络侧获得的UE的IP地址。可选的，如果UE有请求的APN，则上述消息中还可以包含所述UE请求的APN。
可选地，非3GPP接入网关不为ePDG，例如为TWAN/HSGW时，则UE与演进的分组数据网元交互的IKE鉴权请求消息可以替换为其它类型的消息。而非3GPP接入网关不为ePDG，例如为TWAN/HSGW时，或者移动性管理网元不为MM，例如为SGSN时，可以直接采用S502-S514的方法，也可以替换其中的一些消息名称而采用本发明实施例的P-GW的选择方法。
S502：所述ePDG向MME发送鉴权与授权请求消息，所述鉴权与授权请求消息中包含请求类型，所述请求类型包括通过初始附着流程接入的所述EPC，或者通过切换流程接入的所述EPC，或者通过多接入流程接入的所述EPC。
所述ePDG在接收到所述IKE鉴权请求消息后，可以根据所述IKE鉴权请求消息中是否包含所述UE的IP地址或者是否为全零的IP地址，来确定所述UE的请求类型，其中，所述请求类型可以指示UE是通过何种接入流程接入的EPC，如所述请求类型包括通过切换流程或者初始附着流程或者多接入流程接入的所述EPC。具体地，如果所述IKE鉴权请求消息中包含所述UE的IP地址即包含不为全零的IP地址，则确定所述UE是通过切换流程或者多接入流程接入的EPC，否则，确定所述UE是通过初始附着流程接入的EPC。
所述ePDG可以将所述请求类型通过所述鉴权与授权请求消息发送给所述MME，所述鉴权与授权请求消息用于请求对所述UE进行鉴权与授权。具实现时，所述ePDG可以在所述鉴权与授权请求消息中定义参数如请求类型(Request Type)或附着类型(Attach Type)，当所述UE是通过切换流程或多接入流程接入时，所述ePDG可以将所述请求类型或所述附着类型的值设置为“切换(handover)”或“多接入(multiple access)”，当所述UE是通过初始附着流程接入时，将所述所述请求类型或所述附着类型的值设置为“初始附着(initial attach)”或“初始请求(initial request)”，从而所述MME根据所述鉴权与授权请求消息中的参数(即请求类型或附着类型)的值，就可以知道UE 的请求类型；又例如，所述ePDG可以在所述鉴权与授权请求消息中定义一个32位无符号整型参数，如DER-SWm-Flags，当所述UE是通过初始附着流程接入时，将该参数第0位设置为1，当所述UE是通过切换流程或多接入流程接入，将该参数第0位设置为0，反之亦然。所述请求类型的具体实现方式，本发明实施例在此不作限定。可选地，所述ePDG也可以通过其它消息将所述请求类型发送给MME。需要说明的是，所述ePDG也可以不将所述UE的请求类型发送给所述MME，而由MME自身确定所述UE的请求类型。
可选地，如果ePDG收到的IKE鉴权请求消息中包含所述UE请求的APN，则ePDG可以将所述UE请求的APN通过所述鉴权与授权请求消息发送给所述MME，则所述鉴权与授权请求消息中还可以包含所述UE请求的APN，或者所述ePDG也可以通过其它消息将所述UE请求的APN的信息发送给所述MME。
可选地，所述鉴权与授权请求消息中还可以包含接入类型(RAT type)信息，所述接入类型信息用于指示所述UE采用的何种接入技术接入的。例如，当所述UE是通过无线局域网络(Wireless Local Area Networks，WLAN)接入时，所述接入类型信息可以设置为WLAN，或可信WLAN或非可信WLAN等。
可选地，所述鉴权与授权请求消息中还可以包含所述UE的本地IP地址(UE local IP)，所述UE的本地IP地址是所述非3GPP接入网为所述UE分配的IP地址。由于所述UE的本地IP地址用来与所述ePDG建立IPSec流程，因此，所述ePDG可以获取所述UE本地IP地址，并将此地址发送给所述MME。
S503：所述MME向HSS发送鉴权请求(authentication request)消息，以请求获取所述UE的鉴权向量。
S504：所述HSS向所述MME返回鉴权响应(authentication response)消息，所述鉴权响应消息中包含所述UE的鉴权向量。
S505：所述MME利用所述UE的鉴权向量，对所述UE进行鉴权。
S503-S505的鉴权流程与现有技术中3GPP AAA Server对UE进行鉴权的流程类似，本发明实施例在此不再赘述。
S506：当对所述UE鉴权成功时，所述MME向所述HSS发送非3GPP的IP接入注册请求(Non-3GPP IP Access Registration request)消息或者更新位置请 求(Update location request)消息，以请求获取所述UE的签约数据。
由于所述MME与所述HSS之间支持S6a接口和SWx接口，因而所述MME可以通过非3GPP的IP接入注册请求消息或者更新位置请求消息，请求获取所述UE的签约数据，其中，所述非3GPP的IP接入注册请求消息或者所述更新位置请求消息中可以包含所述UE的IMSI和所述MME的标识。
S507：所述HSS向所述MME返回非3GPP的IP接入注册响应(Non-3GPP IP Access Registration response)消息或者更新位置响应(Update location response)消息，所述非3GPP的IP接入注册相应消息或者更新位置响应消息携带所述UE的签约数据。
所述HSS在收到所述MME发送的所述非3GPP的IP接入注册请求消息或者所述更新位置请求消息后，可以保存所述MME的标识，完成所述MME到所述HSS的注册。
所述MME在获取到所述UE的签约数据之后，可以根据所述UE的签约数据，对所述UE进行授权。
S508：所述MME确定所述UE是从非3GPP网络接入EPC。
现有技术中，针对从3GPP网络接入的UE，由MME为该UE选择目标P-GW，针对从非3GPP网络接入的UE，由ePDG为该UE选择目标P-GW，并且MME和ePDG选择目标P-GW的机制并不相同。
不同于现有技术，在本发明实施例中，对于从非3GPP网络接入的UE，也可以由MME为该UE选择目标P-GW。因而所述MME在为UE选择目标P-GW之前，可以判断该UE是从3GPP网络接入还是从非3GPP网络接入，对于从非3GPP网络接入的UE，可以执行S509，进行P-GW的选择。而对于3GPP网络接入的UE，可以采用现有技术中的方式，进行P-GW的选择。
对于如何判断所述UE是否从非3GPP网络接入，可以有多种方式，本发明实施例在此不作限定。例如，如果所述MME接收到所述ePDG为所述UE发送的鉴权与授权请求消息，则可以确定所述UE是从非3GPP网络接入；又例如，所述MME可以根据所述ePDG提供的RAT type或请求类型，确定所述UE是从非3GPP网络接入。
S509：所述MME确定目标APN，并根据所述请求类型选择目标P-GW。
具体地，如果所述UE请求了APN，例如所述IKE鉴权请求消息中包含所述UE请求的APN，则所述MME可以将所述UE请求的APN与UE的签约数据中的APN配置参数中的APN进行匹配，如果匹配上了，则将所述UE请求的APN作为目标APN，否则所述MME可以拒绝UE的鉴权与授权请求；如果所述UE没有请求APN，则所述MME可以使用签约数据中的缺省APN作为目标APN。
所述MME在选择目标P-GW时，可以针对所述UE是通过初始附着流程还是切换流程或多接入流程接入的所述EPC，采用不同的P-GW选择机制。因此，所述MME可以根据所述UE的请求类型，确定所述UE是通过初始附着流程还是切换流程或多接入流程接入的所述EPC。
对于通过初始附着流程接入的UE，所述MME可以根据所述目标APN，选择目标P-GW，例如，所述MME可以将目标APN发送给DNS服务器，所述DNS服务器可以向所述MME返回能够连接该目标APN的P-GW列表(PGW list或者P-GW list)，所述MME可以从该P-GW列表中选择合适的P-GW；进一步，所述MME可以根据所述目标APN和所述ePDG的标识(ePDG ID)或者可以根据所述目标APN和所述UE的IP地址，选择目标P-GW，通过这种方式，可以选择离所述UE更近的P-GW，例如，所述MME可以向DNS服务器发DNS查询消息，以请求获取可以连接该目标APN的P-GW，接收DNS服务器返回的P-GW列表，根据所述ePDG的标识或者所述UE的IP地址，从所述P-GW列表中选择离所述UE最近的/较近的P-GW。
对于通过切换流程或多接入流程接入的UE，所述MME可以使用所述UE的签约数据中所述目标APN对应的APN配置参数中的P-GW(即所述UE的签约数中与所述目标APN对应的P-GW)作为目标P-GW。
S510：所述MME向所述ePDG发送鉴权与授权回复消息，所述鉴权与授权回复消息中包含所述目标APN对应的APN配置参数，所述目标APN对应的APN配置参数中包含所述目标APN和所述目标P-GW的标识。
所述目标APN对应的APN配置参数中已经包含了所述目标APN，则对于通过初始附着流程接入的UE，所述MME可以判断所述目标APN对应的APN配置 参数中是否包含所述目标P-GW的标识，如果所述目标APN对应的APN配置参数中包含P-GW的标识，但该P-GW的标识不为所述目标P-GW的标识，则将所述目标APN对应的APN配置参数中包含的P-GW的标识替换为所述目标P-GW的标识，如果所述目标APN对应的APN配置参数中不包含P-GW的标识，则在所述目标APN对应的APN配置参数中用于指示P-GW的标识的位置增加所述目标P-GW的标识。
对于通过切换流程或多接入流程接入的UE，由于所述目标P-GW即为所述目标APN对应的APN配置参数中的P-GW(即所述UE的签约数据中所述目标APN对应的P-GW)，因此所述目标APN对应的APN配置参数中中已经包含了所述目标P-GW的标识和所述目标APN。
S511：所述ePDG为所述目标APN建立与所述目标P-GW之间的PDN连接。
不同于现有技术，所述ePDG不需要判断所述UE是通过初始附着流程接入还是通过切换流程或多接入流程接入，也不需要选择目标APN和目标P-GW。只需从所述目标APN对应的APN配置参数中获取目标APN和目标PGW的标识，根据所述目标APN与目标P-GW，建立PDN连接。
S512：所述ePDG向所述MME发送鉴权与授权确认(Authentication and Authorization ACK)消息，所述鉴权与授权确认消息中包含用于指示所述PDN连接建立成功的指示消息。
S513：所述MME向所述HSS发送通知请求(Notify Request)消息，所述通知请求消息中包含所述目标APN和所述目标P-GW的标识，以将所述目标P-GW的标识注册到所述HSS。
所述MME可以在所述PDN连接建立成功之后，将所述目标P-GW的标识注册到所述HSS，避免所述PDN连接建立失败时将所述目标P-GW的标识注册到所述HSS。
S512为可选步骤，所述MME也可以在为目标APN选择目标P-GW之后，将所述目标P-GW的标识注册到所述HSS，而无需判断所述PDN连接是否建立成功。
S514：所述HSS向所述MME返回通知响应(Notify Response)消息。
S512-S514为可选步骤，所述MME也可以不将所述目标P-GW的标识注册到所述HSS，也可以保证3GPP与非3GPP使用相同的P-GW。
结合图2(a)所述的网络架构，本发明实施例还提供了一种P-GW的选择方法，如图6所示。不同于上一实施例中，由MME为目标APN选择目标P-GW的方案，在本发明实施例中，由MME为目标APN选择P-GW，由ePDG根据UE当前流程决策是否使用MME选择的P-GW作为目标P-GW，具体方法如下，S601-S608可以参考S501-S508，本发明实施例在此不再赘述。当移动性管理网元为SGSN或者非3GPP接入网关为TWAN/HSGW时，也可以参考如下方法进行P-GW的选择。
S601：UE向ePDG发送IKE鉴权请求消息。
S602：所述ePDG向MME发送鉴权与授权请求消息。
不同于S502，所述ePDG无需将所述UE的请求类型发送给所述MME，所述鉴权与授权请求消息中可以不包含所述UE的请求类型。所述MME支持非3GPP接入网的鉴权与授权功能。
S603：所述MME向HSS发送鉴权请求消息，以请求获取所述UE的鉴权向量。
S604：所述HSS向所述MME返回鉴权响应消息，所述鉴权响应消息中包含所述UE的鉴权向量。
S605：所述MME利用所述UE的鉴权向量对UE进行鉴权。
S606：当对所述UE鉴权成功时，所述MME向所述HSS发送非3GPP的IP接入注册请求消息或者更新位置请求消息，以请求获取所述UE的签约数据。
S607：所述HSS向所述MME返回非3GPP的IP接入注册响应消息或者更新位置响应消息，所述非3GPP的IP接入注册相应消息或者更新位置响应消息携带所述UE的签约数据。
所述MME可以根据所述UE的签约数据，对所述UE进行授权。
S608：所述MME确定所述UE是从非3GPP网络接入EPC。
S609：所述MME确定目标APN，并根据所述目标APN选择P-GW。
所述MME确定目标APN的方式具体可以参考S509，本发明实施例在此不再赘述。
然而，不同于S509，所述MME不判断UE的请求类型，只是根据所述目标APN，选择P-GW；进一步，所述MME可以根据所述目标APN和所述ePDG的标识(ePDG ID)或者可以根据所述目标APN和所述UE的IP地址，选择P-GW，以选择离所述UE更近的P-GW。所述MME基于目标APN选择P-GW的方式、根据所述目标APN和所述ePDG的标识(ePDG ID)以及根据所述目标APN和所述UE的IP地址，可以参考S509。
S610：所述MME向所述ePDG发送鉴权与授权回复消息，所述鉴权与授权回复消息中包含所述目标APN、所述MME选择的P-GW的标识以及所述UE的签约数据中所述目标APN对应的APN配置参数中的P-GW的标识。
具体的，所述UE的签约数据中所述目标APN对应的APN配置参数中已经包含了所述目标APN和所述UE的签约数据中所述目标APN对应的P-GW的标识(即所述目标APN对应的APN配置参数中的P-GW的标识)，则所述MME可以在所述鉴权与授权回复消息中定义用于指示所述MME选择的P-GW的标识的新参数PGW ID-MME，则所述鉴权与授权回复消息中包含所述APN配置参数和PGW ID-MME，所述APN配置参数中包含所述目标APN以及P-GW的标识(所述UE的签约数据中所述目标APN对应的P-GW的标识)；或者，所述MME可以在所述APN配置参数中定义用于指示所述MME选择的P-GW的标识的新参数PGW ID-MME，则所述鉴权与授权回复消息中包含所述APN配置参数，所述APN配置参数中包含所述目标APN、P-GW的标识(所述UE的签约数据中所述目标APN对应的P-GW的标识)以及PGW ID-MME；其中，PGW ID-MME的值为所述MME选择的P-GW的标识。
S611：所述ePDG根据所述UE的请求类型，从所述MME选择的P-GW以及所述目标APN对应的APN配置参数中的P-GW的标识中选择目标P-GW。
不同于现有技术，如果所述ePDG确定所述UE是通过初始附着流程接入的EPC，则所述ePDG将所述MME选择的P-GW作为所述目标P-GW；如果所述ePDG确定所述UE为通过切换流程或多接入流程接入的EPC，则所述ePDG将 所述所述目标APN对应的APN配置参数中的P-GW的标识作为所述目标P-GW。
S612：所述ePDG为所述目标APN建立与所述目标P-GW之间的PDN连接。
S613：所述PDN连接建立成功后，所述ePDG将所述目标P-GW的标识发送给所述MME。
在所述PDG建立成功后，所述ePDG可以通知所述MME所述PDN连接建立成功，并可以在上述消息中将所述目标P-GW的标识发送给所述MME。
S613为可选步骤，则MME可以通过确定所述UE的请求类型，来确定所述目标P-GW，而不需要从所述ePDG处获取。判别UE是否为初始附着流程，判别方案如前文S502中所述。如果是则通过S614-S615将目标PGW标识注册到HSS。
S614：所述MME向所述HSS发送通知请求消息，所述通知请求消息中包含所述目标P-GW的标识，以将所述目标P-GW的标识注册到所述HSS。
S615：所述HSS向所述MME返回通知响应(Notify Response)消息。
S613-S615为可选步骤，所述MME也可以不将所述目标P-GW的标识注册到所述HSS。
对应图3或图5所述的P-GW的选择方法，本发明实施例提供了一种移动性管理网元70，将3GPP AAA Server的部分/全部的逻辑功能融合到了移动性管理网元70中，如图7所示，该移动性管理网元70可以包括接收单元701、确定单元702、选择单元703和发送单元704；
所述接收单元701，用于在用户设备UE从非3GPP网络接入到EPC之后，接收非3GPP接入网关发送的请求消息。由于将3GPP AAA Server的部分/全部的逻辑功能融合到了移动性管理网元中，因此所述接收单元701可以接收来自非3GPP网络的请求消息，如接收所述非3GPP接入网关发送的鉴权与授权请求消息。
所述确定单元702，用于确定所述UE的请求类型，所述请求类型包括通过初始附着流程接入的所述EPC、通过切换流程接入的所述EPC或者通过多接入流程接入的所述EPC。所述确定单元702可以通过以下方式确定所述请求类型： 通过确定所述移动性管理网元中是否存在所述UE的与所述目标APN对应的上下文，确定所述请求类型；或者，所述请求消息中包含所述请求类型或者所述请求类型的信息，通过所述请求消息确定所述请求类型；或者，接收所述非3GPP接入网关发送的所述请求类型或者所述请求类型的信息。上述所述请求类型的信息可以是根据所述请求类型所生成的信息，从而所述移动性管理网元根据所述请求类型的信息，可以确定所述UE的请求类型。进一步，所述选择单元703根据所述目标APN选择所述目标P-GW可以包括：所述选择单元703根据所述目标APN和所述非3GPP接入网关的标识，选择目标P-GW；或者，所述选择单元703根据所述目标APN和所述UE的本地网络之间互连的协议IP地址，选择目标P-GW，所述UE的本地IP地址为所述非3GPP接入网为所述UE分配的IP地址。
所述选择单元703，用于根据所述请求类型，为所述UE的目标APN选择目标P-GW。在选择目标P-GW之前，所述选择单元703还可以确定所述UE的APN。在选择目标P-GW时，如果所述请求类型为通过初始附着流程接入的所述EPC，所述选择单元703可以根据所述目标APN选择所述目标P-GW；或者，如果所述请求类型为通过切换流程或多接入流程接入的所述EPC，所述选择单元703可以获取所述UE的签约数据中所述目标APN对应APN配置参数中的P-GW的标识，将所述目标APN对应APN配置参数中的P-GW作为所述目标P-GW。
所述发送单元704，用于根据所述请求消息，向所述非3GPP接入网关返回响应消息，所述响应消息中包含所述目标APN以及所述目标P-GW的标识。例如，若所述UE的签约数据中所述目标APN对应的APN配置参数不包含P-GW的标识，则所述发送单元704可以在所述目标APN对应的APN配置参数中增加所述目标P-GW的标识，若所述目标APN对应的APN配置参数中包含的P-GW的标识不是所述目标P-GW的标识，则将所述目标APN对应的APN配置参数中的P-GW的标识替换为所述目标P-GW的标识，从而所述目标APN对应的APN配置参数中包含所述目标APN和所述目标P-GW的标识；所述发送单元704可以向所述非3GPP接入网关发送响应消息，所述响应中包含所述目标APN对应的APN配置参数。当所述请求消息为鉴权与授权请求消息时，所述响应消息可以 为鉴权与授权回复消息。
可选地，所述移动性管理网元支持非3GPP接入网的鉴权与授权功能。
在本发明实施例中，所述移动性管理网元可以不将所述目标P-GW的标识注册到HSS，也可以保证UE在3GPP网络与非3GPP网络之间切换时使用相同的P-GW。可选地，所述移动性管理网元还可以将所述目标P-GW的标识注册到HSS，则所述发送单元704还用于在向所述非3GPP接入网关返回响应消息之后，向归属用户服务器HSS发送通知消息，所述通知消息包含所述目标APN和所述目标P-GW的标识，避免了现有技术中将P-GW的标识注册到HSS的过程需要P-GW与3GPP AAA Server之间支持S6b接口。
可选地，所述移动性管理网元也可以只在所述PDN建立成功时，才将所述P-GW的标识注册到HSS。则所述确定单元702还用于在所述发送单元704向所述HSS发送通知消息之前，确定为所述目标APN建立的所述非3GPP接入网关与所述目标P-GW之间的分组数据网PDN建立成功。
可选地，由于针对从3GPP网络接入的UE，采用现有技术由移动性管理网元为该UE选择目标P-GW，针对从非3GPP网络接入的UE，采用本发明实施例的P-GW的选择方案，由移动性管理网元为该UE选择目标P-GW，但是针对从3GPP网络接入的UE和从非3GPP网络接入的UE，选择目标P-GW的机制并不相同。因此，所述确定单元702还用于在确定所述UE的请求类型之前，确定所述UE是从非3GPP网络接入所述EPC的。保证了只有是从非3GPP接入的UE，才采用本发明实施例中的P-GW的选择方案。
本发明实施例中，将3GPP AAA Server的部分/全部的逻辑功能融合到了移动性管理网元70中，简化了网络架构，使得移动性管理网元70的接收单元701可以接收非3GPP接入网关发送的请求消息，选择单元703可以为从非3GPP网络接入的UE选择目标P-GW，发送单元704向非3GPP接入网返回包含所述UE的目标APN和所述目标P-GW的标识的响应消息，适应了简化的网络架构实现了P-GW的选择。
对应图3或图5所述的P-GW的选择方法，本发明实施例提供了一种接入网关80，如图8所示，该接入网关80为非3GPP网络的接入网关，如ePDG、TWAN 或者HSGW，该接入网关80可以包括发送单元801、接收单元802和建立单元803；
所述发送单元801，用于在用户设备UE从所述非3GPP网络接入到EPC之后，向移动性管理网元发送请求消息。在本发明实施例中，将3GPP AAA Server的部分/全部的逻辑功能融合到了移动性管理网元中，从而接入网关80可以与移动性管理网元直接进行信令交互。可选地，所述移动性管理网元支持非3GPP接入网的鉴权与授权功能。
所述接收单元802，用于接收所述移动性管理网元根据所述请求消息发送的响应消息，所述响应消息中包含所述UE的目标APN和为所述目标APN选择的目标P-GW的标识。
所述建立单元803，用于根据所述目标APN和所述目标P-GW的标识，为所述目标APN建立所述接入网关与所述目标P-GW之间的PDN连接。
可选地，所述接入网关还包括：
确定单元804，用于在所述接收单元802接收移动性管理网元发送的所述UE的目标接入点名称APN和目标P-GW的标识之前，确定所述UE的请求类型，所述请求类型包括通过初始附着流程接入的所述EPC、通过切换流程接入的所述EPC或者通过多接入流程接入的所述EPC；则所述发送单元801还用于在所述接收单元802接收移动性管理网元发送的所述UE的目标接入点名称APN和目标P-GW的标识之前，将所述请求类型或者所述请求类型的信息发送给所述移动性管理网元。所述请求类型的信息可以是根据所述请求类型所生成的信息，所述移动性管理网元根据所述请求类型的信息，确定所述UE的请求类型。
可选地，所述发送单元801还用于在所述PDN连接建立成功之后，向所述移动性管理网元发送通知消息，所述通知消息包含用于指示所述PDN连接建立成功的指示信息。从而所述移动性管理网元根据所述通知消息，可以确定所述PDN连接建立成功。
可选地，所述发送单元还用于，在向移动性管理网元发送请求消息之前，选择所述移动性管理网元。例如，根据预配置信息，选择所述移动性管理网元；其中，所述预配置信息包含所述UE的位置信息与所述移动性管理网元的标识 的对应关系，或者所述预配置信息包含所述非3GPP接入网关的标识与所述移动性管理网元的标识的对应关系；
或者，将所述UE的国际移动用户识别码IMSI发送给路由代理节点，以便所述路由代理节点根据所述UE的IMSI为所述UE选择所述移动性管理网元；
或者，
所述非3GPP接入网关根据所述UE的位置信息构造移动性管理网元的完全合格域名，并将所述完全合格域名发送给域名解析服务器DNS，接收所述DNS根据所述完全合格域名确定的移动性管理网元的标识，从所述DNS确定的移动性管理网元中选择移动性管理网元作为所述移动性管理网元。
本发明实施例中，将3GPP AAA Server的部分/全部的逻辑功能融合到了移动性管理网元中，简化了网络架构，使得接入网关的发送单元801可以向移动性管理网元发送请求消息，接收单元802可以接收所述请求消息的响应消息，所述响应消息中包含所述UE的目标APN和为所述目标APN选择的目标P-GW的标识，从而所述建立单元803可以根据所述目标APN和所述目标P-GW的标识，建立所述接入网关与所述目标P-GW之间的PDN连接，适应了简化的网络架构实现了P-GW的选择。
对应图4或图6所述的P-GW的选择方法，本发明实施例提供了一种移动性管理网元90，将3GPP AAA Server的部分/全部的逻辑功能融合到了移动性管理网元90中，如图9所示，该移动性管理网元90可以包括接收单元901、选择单元902、获取单元903和发送单元904；
所述接收单元901，用于在用户设备UE从非3GPP网络接入到演进分组核心网EPC之后，接收非3GPP接入网关发送的请求消息。
所述选择单元902，用于根据所述UE的目标APN选择P-GW。所述选择单元902在选择目标P-GW之前，可以确定所述UE的目标APN。所述选择单元902在根据所述UE的目标APN选择P-GW时，可以根据所述目标APN，选择目标P-GW，例如，所述MME可以将目标APN发送给DNS服务器，所述DNS服务器可以向所述MME返回能够连接该目标APN的P-GW列表(PGW list或者P-GW  list)，所述MME可以从该P-GW列表中选择合适的P-GW。所述选择单元902还可以根据所述目标APN和所述非3GPP接入网关的标识，选择目标P-GW；或者，根据所述目标APN和所述UE的本地IP地址，选择目标P-GW；从而选择离所述UE更近的P-GW，其中，所述UE的本地IP地址为所述非3GPP接入网为所述UE分配的IP地址。
所述获取单元903，获取所述UE的签约数据中所述目标APN对应的APN配置参数中的P-GW的标识；
所述发送单元904，用于根据所述请求消息，向所述非3GPP接入网关返回响应消息，所述响应消息中包含所述UE的目标APN、所述移动性管理网元选择的P-GW的标识和所述目标APN对应的APN配置参数中的P-GW的标识，以便所述非3GPP接入网关从所述移动性管理网元选择的P-GW和所述目标APN对应的APN配置参数中的P-GW中为所述目标APN选择目标P-GW。可选地，上述请求消息可以为所述非3GPP接入网关发送的鉴权与授权请求消息；则所述响应消息可以为鉴权与授权回复消息。
可选地，所述移动性管理网元支持非3GPP接入网的鉴权与授权功能。
可选地，所述发送单元904根据所述请求消息，向所述非3GPP接入网关返回响应消息可以包括：所述发送单元904在所述响应消息中增加用于指示所述移动性管理网元选择的P-GW的标识的第一参数，并向所述非3GPP接入网关发送所述响应消息，所述响应消息中包含所述目标APN对应的APN配置参数和所述第一参数；或者，所述发送单元904在所述目标APN对应的APN配置参数中增加用于指示移动性管理网元选择的P-GW的标识的第二参数，并向所述非3GPP接入网关发送所述响应消息，所述响应消息中包含所述目标APN对应的APN配置参数，所述目标APN对应的APN配置参数中包含所述第二参数。
可选地，由于采用了融合的网络架构，在本发明实施例中可以不将所述P-GW的标识注册到HSS，也能保证3GPP网络与非3GPP网络使用相同的P-GW。
可选地，也可以将所述P-GW的标识注册到HSS，而不对现有的HSS网元做改动，则所述接收单元901还用于接收所述非3GPP接入网关发送的所述目标 P-GW的标识；所述发送单元904还用于向归属用户服务器HSS发送通知消息，所述通知消息包含所述目标APN和所述目标P-GW的标识。或者，所述选择单元902还可以确定所述UE的请求类型，根据所述UE的请求类型，从所述移动性管理网元选择的P-GW和所述目标APN对应的APN配置参数中的P-GW中确定目标P-GW，则所述发送单元904还用于向归属用户服务器HSS发送通知消息，所述通知消息包含所述目标APN和所述目标P-GW的标识。
可选地，所述选择单元902还可以在根据所述UE的APN选择P-GW之前，确定所述UE是从非3GPP网络接入所述EPC的。从而保证针对从非3GPP接入的UE，采用本发明所述的P-GW的选择方案。
在本发明实施例中，将3GPP AAA Server的部分/全部的逻辑功能融合到了移动性管理网元中，简化了网络架构。并且基于融合的网络架构，移动性管理网元的接收单元901可以接收非3GPP接入网关发送的请求消息，选择单元902可以为从非3GPP网络接入的UE选择P-GW，发送单元904可以向非3GPP接入网关返回包含所述UE的目标APN、所述移动性管理网元选择的P-GW的标识以及所述目标APN对应的APN配置参数中的P-GW的标识的响应消息，由非3GPP接入网关根据所述UE的请求类型从所述移动性管理网元选择的P-GW以及所述目标APN对应的APN配置参数中的P-GW中选择P-GW，从而适应了简化的网络架构实现了P-GW的选择。
对应图4或图6所述的P-GW的选择方法，本发明实施例提供了一种接入网关100，如图10所示，该接入网关100为非3GPP网络的接入网关，如ePDG、TWAN或者HSGW，该接入网关100可以包括：发送单元1001、接收单元1002、选择单元1003和建立单元1004。
所述发送单元1001，用于在用户设备UE从所述非3GPP网络接入到EPC之后，向移动性管理网元发送请求消息，例如，向移动性管理网元发送鉴权与授权请求消息。可选地，所述移动性管理网元支持非3GPP接入网的鉴权与授权功能。
所述接收单元1002，用于接收所述移动性管理网元根据所述请求消息发送的响应消息，所述响应消息中包含所述UE的目标APN、所述移动性管理网元 选择的P-GW的标识和所述UE的签约数据中所述目标APN对应的APN配置参数中的P-GW的标识。可选地，当所述请求消息为鉴权与授权请求消息时，所述响应消息可以为鉴权与授权回复消息。
所述选择单元1003，用于根据所述UE的请求类型，从所述移动性管理网元选择的P-GW和所述目标APN对应的APN配置参数中的P-GW中为所述UE的目标APN选择目标P-GW；其中，所述请求类型包括通过初始附着流程接入的所述EPC、通过切换流程接入的所述EPC或者通过多接入流程接入的所述EPC。例如，如果所述请求类型为通过初始附着流程接入的所述EPC，所述选择单元1003可以选择所述MME选择的P-GW为所述目标P-GW；或者，如果所述请求类型为通过切换流程或多接入流程接入的所述EPC，所述选择单元1003可以选择所述目标APN对应的APN配置参数中的P-GW为所述目标P-GW。
所述建立单元1004，用于根据所述目标APN和所述目标P-GW的标识，为所述目标APN建立所述接入网关与所述目标P-GW之间的PDN连接。
可选地，所述发送单元1001还可以将所述目标P-GW的标识发送给所述移动性管理网元，从而所述移动性管理网元可以获得所述目标P-GW的标识，并将所述目标P-GW的标识注册到HSS。进一步，所述发送单元1001还可以只在所述PDN连接建立成功的情况下，将所述目标P-GW的标识发送给所述移动性管理网元。
可选地，所述发送单元1001还用于，在向移动性管理网元发送请求消息之前，选择所述移动性管理网元。具体实现方式可以参考图8中的发送单元801。
在本发明实施例中，将3GPP AAA Server的部分/全部的逻辑功能融合到了移动性管理网元中，简化了网络架构。并且基于融合的网络架构，使得非3GPP网络的接入网关的发送单元1001可以向移动性管理网元发送请求消息，接收单元1002可以接收移动性管理网元返回的包含所述UE的目标APN、所述移动性管理网元选择的P-GW的标识以及所述目标APN对应的APN配置参数中的P-GW的标识的响应消息，由选择单元1003根据所述UE的请求类型从所述移动性管理网元选择的P-GW以及所述目标APN对应的APN配置参数中的P-GW中选择P-GW，由建立单元1004根据所述目标APN和所述目标P-GW的标识，建立所述接入网关与所述目标P-GW之间的PDN连接。
上述图7-图10装置实施例也可以参考图3-图6方法实施例，比如如何确定UE的目标APN，如何选择目标P-GW等，本发明实施例在此不作赘述。
如图11，为本发明实施例提供的一种用于P-GW选择的装置，所述装置可以包括：
处理器1101、存储器1102、总线1104和通信接口1105。处理器1101、存储器1102和通信接口1105之间通过总线1104连接并完成相互间的通信。
处理器1101可能为单核或多核中央处理单元，或者为特定集成电路，或者为被配置成实施本发明实施例的一个或多个集成电路。
存储器1102可以为高速RAM存储器，也可以为非易失性存储器(non-volatile memory)，例如至少一个磁盘存储器。
存储器1102用于计算机执行指令1103。具体的，计算机执行指令1103中可以包括程序代码。
当所述装置运行时，处理器1101运行计算机执行指令1103，可以执行图3至图6任意之一对应的方法实施例所述的P-GW选择的方法流程。当执行图3-至图6中的移动性管理网元或者MME的步骤时，所述装置可以为移动性管理网元，如MME或者SGSN；当执行图3-至图6中的非3GPP网关或者ePDG的步骤时，所述装置可以为非3GPP网络的接入网关，如ePDG或者TWAN或者HSGW。
本发明实施例提供了一种计算机可读介质，包括计算机执行指令，以供计算机的处理器执行所述计算机执行指令时，所述计算机执行图3至图6任意之一对应的方法实施例所述的P-GW选择的方法。
本发明实施例提供的一种用于P-GW选择的系统，该系统包括：移动性管理网元70和接入网关80；或者包括移动性管理网元90和接入网关100；移动性管理网元70和接入网关80各自执行的动作以及它们之间的交互，可以参见图3和图5对应的方法实施例的描述，也可以参考图7和图8对应的装置实施例的描述，移动性管理网元90和接入网关100各自执行的动作以及它们之间的交互，可以参见图4和图6对应的方法实施例的描述，也可以参考图9和图10对应的装 置实施例的描述，此处不再赘述。
另外，在本发明各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以是两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本发明的技术方案本质上或者说对现有技术做出贡献的部分，或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本发明各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、计算机软件或者二者的结合来实现，为了清楚地说明硬件和软件的可互换性，在上述说明中已经按照功能一般性地描述了各示例的组成及步骤。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本发明的范围。
所属领域的技术人员可以清楚地了解到，为了描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另 外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另外，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口、装置或单元的间接耦合或通信连接，也可以是电的，机械的或其它的形式连接。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本发明实施例方案的目的。
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到各种等效的修改或替换，这些修改或替换都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应以权利要求的保护范围为准。

Claims (51)

  1. 一种分组数据网关P-GW的选择方法，其特征在于，包括：
    在用户设备UE从非第三代伙伴计划3GPP网络接入到演进分组核心网EPC之后，移动性管理网元接收非3GPP接入网关发送的请求消息；
    所述移动性管理网元确定所述UE的请求类型，所述请求类型包括通过初始附着流程接入的所述EPC、通过切换流程接入的所述EPC或者通过多接入流程接入的所述EPC；
    所述移动性管理网元根据所述请求类型，为所述UE的目标接入点名称APN选择目标P-GW；
    所述移动性管理网元根据所述请求消息，向所述非3GPP接入网关返回响应消息，所述响应消息中包含所述目标APN以及所述目标P-GW的标识。
  2. 根据权利要求1所述的方法，其特征在于，所述移动性管理网元根据所述请求消息，向所述非3GPP接入网关返回响应消息之后，所述方法还包括：
    所述移动性管理网元向归属用户服务器HSS发送通知消息，所述通知消息包含所述目标APN和所述目标P-GW的标识。
  3. 根据权利要求2所述的方法，其特征在于，所述移动性管理网元向归属用户服务器HSS发送通知消息之前，所述方法还包括：
    所述移动性管理网元确定为所述目标APN建立的所述非3GPP接入网关与所述目标P-GW之间的分组数据网PDN建立成功。
  4. 根据权利要求1-3任一项所述的方法，其特征在于，所述请求消息为所述非3GPP接入网关发送的鉴权与授权请求消息；所述响应消息为鉴权与授权回复消息。
  5. 根据权利要求1-4任一项所述的方法，其特征在于，所述移动性管理网元根据所述请求消息，向所述非3GPP接入网关返回响应消息，所述响应消息中包含所述目标APN以及所述目标P-GW的标识，包括：
    若所述UE的签约数据中所述目标APN对应的APN配置参数不包含P-GW的标识，则在所述目标APN对应的APN配置参数中增加所述目标P-GW的标识；
    若所述目标APN对应的APN配置参数中包含的P-GW的标识不是所述目标P-GW的标识，则所述移动性管理网元将所述目标APN对应的APN配置参数中的P-GW的标识替换为所述目标P-GW的标识；
    所述移动性管理网元向所述非3GPP接入网关发送所述响应消息，所述响应消息中包含所述目标APN对应的APN配置参数，所述目标APN对应的APN配置参数中包含所述目标APN和所述目标P-GW的标识。
  6. 根据权利要求1-5任一项所述的方法，其特征在于，所述移动性管理网元确定所述UE的请求类型包括：
    所述移动性管理网元通过确定所述移动性管理网元中是否存在所述UE的与所述目标APN对应的上下文，确定所述请求类型；或者，
    所述请求消息中包含所述请求类型或者所述请求类型的信息，所述移动性管理网元通过所述请求消息确定所述请求类型；或者，
    所述移动性管理网元接收所述非3GPP接入网关发送的所述请求类型或者所述请求类型的信息。
  7. 根据权利要求1-6任一项所述的方法，其特征在于，所述移动性管理网元确定所述UE的请求类型之前，还包括：
    所述移动性管理网元确定所述UE是从非3GPP网络接入所述EPC的。
  8. 根据权利要求1-7任一项所述的方法，其特征在于，所述移动性管理网元根据所述请求类型，为所述目标APN选择目标P-GW包括：
    如果所述请求类型为通过初始附着流程接入的所述EPC时，所述移动性管理网元根据所述目标APN选择所述目标P-GW；或者，
    如果所述请求类型为通过切换流程或多接入流程接入的所述EPC时，所述移动性管理网元获取所述UE的签约数据中所述目标APN对应APN配置参数中的P-GW的标识，将所述目标APN对应APN配置参数中的P-GW作为所述目标P-GW。
  9. 根据权利要求8所述的方法，其特征在于，所述根据所述目标APN选择所述目标P-GW包括：
    所述移动性管理网元根据所述目标APN和所述非3GPP接入网关的标识， 选择目标P-GW；或者，
    所述移动性管理网元根据所述目标APN和所述UE的本地网络之间互连的协议IP地址，选择目标P-GW；其中，所述UE的本地IP地址为所述非3GPP接入网为所述UE分配的IP地址。
  10. 根据权利要求1-9任一项所述的方法，其特征在于，所述移动性管理网元根据所述请求类型，为所述UE的目标接入点名称APN选择目标P-GW之前，还包括：
    所述移动性管理网元确定所述UE的目标APN。
  11. 一种分组数据网关P-GW的选择方法，其特征在于，包括：
    在用户设备UE从非第三代伙伴计划3GPP网络接入到演进分组核心网EPC之后，非3GPP接入网关向移动性管理网元发送请求消息；
    所述非3GPP接入网关接收所述移动性管理网元根据所述请求消息发送的响应消息，所述响应消息中包含所述UE的目标接入点名称APN和为所述目标APN选择的目标P-GW的标识；
    所述非3GPP接入网关根据所述目标APN和所述目标P-GW的标识，为所述目标APN建立所述非3GPP接入网关与所述目标P-GW之间的分组数据网PDN连接。
  12. 根据权利要求11所述的方法，其特征在于，非3GPP接入网关接收移动性管理网元发送的所述UE的目标接入点名称APN和目标P-GW的标识之前，所述方法包括：
    所述非3GPP接入网关确定所述UE的请求类型，所述请求类型包括通过初始附着流程接入的所述EPC、通过切换流程接入的所述EPC或者通过多接入流程接入的所述EPC；
    所述非3GPP接入网关将所述请求类型或者所述请求类型的信息发送给所述移动性管理网元。
  13. 根据权利要求11或12所述的方法，其特征在于，所述方法还包括：
    在所述PDN连接建立成功之后，所述非3GPP接入网关向所述移动性管理网元发送通知消息，所述通知消息包含用于指示所述PDN连接建立成功的指示 信息。
  14. 根据权利要求11-13任一项所述的方法，所述非3GPP接入网关向移动性管理网元发送请求消息之前，所述方法还包括：
    所述非3GPP接入网关根据预配置信息，选择所述移动性管理网元；其中，所述预配置信息包含所述UE的位置信息与所述移动性管理网元的标识的对应关系，或者所述预配置信息包含所述非3GPP接入网关的标识与所述移动性管理网元的标识的对应关系；
    或者，
    所述非3GPP接入网关将所述UE的国际移动用户识别码IMSI发送给路由代理节点，以便所述路由代理节点根据所述UE的IMSI为所述UE选择所述移动性管理网元；
    或者，
    所述非3GPP接入网关根据所述UE的位置信息构造移动性管理网元的完全合格域名，并将所述完全合格域名发送给域名解析服务器DNS，接收所述DNS根据所述完全合格域名确定的移动性管理网元的标识，从所述DNS确定的移动性管理网元中选择移动性管理网元作为所述移动性管理网元。
  15. 一种分组数据网关P-GW的选择方法，其特征在于，包括：
    在用户设备UE从非第三代伙伴计划3GPP网络接入到演进分组核心网EPC之后，移动性管理网元接收非3GPP接入网关发送的请求消息；
    所述移动性管理网元根据所述UE的目标接入点名称APN选择P-GW；
    所述移动性管理网元获取所述UE的签约数据中所述目标APN对应的APN配置参数中的P-GW的标识；
    所述移动性管理网元根据所述请求消息，向所述非3GPP接入网关返回响应消息，所述响应消息中包含所述UE的目标APN、所述移动性管理网元选择的P-GW的标识和所述目标APN对应的APN配置参数中的P-GW的标识，以便所述非3GPP接入网关从所述移动性管理网元选择的P-GW和所述目标APN对应的APN配置参数中的P-GW中为所述目标APN选择目标P-GW。
  16. 根据权利要求15所述的方法，其特征在于，所述方法还包括：
    所述移动性管理网元接收所述非3GPP接入网关发送的所述目标P-GW的标识；
    所述移动性管理网元向归属用户服务器HSS发送通知消息，所述通知消息包含所述目标APN和所述目标P-GW的标识。
  17. 根据权利要求15或16所述的方法，其特征在于，所述请求消息为所述非3GPP接入网关发送的鉴权与授权请求消息；所述响应消息为鉴权与授权回复消息。
  18. 根据权利要求15-17任一项所述的方法，其特征在于，所述移动性管理网元根据所述请求消息，向所述非3GPP接入网关返回响应消息，所述响应消息中包含所述UE的目标APN、所述移动性管理网元选择的P-GW的标识和所述目标APN对应的APN配置参数中的P-GW的标识包括：
    所述移动性管理网元在所述响应消息中增加用于指示所述移动性管理网元选择的P-GW的标识的第一参数，并向所述非3GPP接入网关发送所述响应消息，所述响应消息中包含所述目标APN对应的APN配置参数和所述第一参数；或者，所述移动性管理网元在所述目标APN对应的APN配置参数中增加用于指示移动性管理网元选择的P-GW的标识的第二参数，并向所述非3GPP接入网关发送所述响应消息，所述响应消息中包含所述目标APN对应的APN配置参数，所述目标APN对应的APN配置参数中包含所述第二参数。
  19. 根据权利要求15-18任一项所述的方法，其特征在于，所述移动性管理网元根据所述UE的目标接入点名称APN选择P-GW之前，所述方法还包括：
    所述移动性管理网元确定所述UE是从非3GPP网络接入所述EPC的。
  20. 根据权利要求15-19任一项所述的方法，其特征在于，所述移动性管理网元根据所述UE的目标接入点名称APN选择P-GW，包括：
    所述移动性管理网元根据所述目标APN和所述非3GPP接入网关的标识，选择目标P-GW；或者，
    所述移动性管理网元根据所述目标APN和所述UE的本地IP地址，选择目标P-GW；其中，所述UE的本地IP地址为所述非3GPP接入网为所述UE分配的IP地址。
  21. 根据权利要求15-20任一项所述的方法，其特征在于，所述移动性管理网元根据所述UE的目标接入点名称APN选择P-GW之前，所述方法还包括：
    所述移动性管理网元确定所述UE的目标APN。
  22. 一种分组数据网关P-GW的注册方法，其特征在于，包括：
    在用户设备UE从非第三代伙伴计划3GPP网络接入到演进分组核心网EPC之后，非3GPP接入网关向移动性管理网元发送请求消息；
    所述非3GPP接入网关接收所述移动性管理网元根据所述请求消息发送的响应消息，所述响应消息中包含所述UE的目标接入点名称APN、所述移动性管理网元选择的P-GW的标识和所述UE的签约数据中所述目标APN对应的APN配置参数中的P-GW的标识；
    所述非3GPP接入网关根据所述UE的请求类型，从所述移动性管理网元选择的P-GW和所述目标APN对应的APN配置参数中的P-GW中为所述UE的目标APN选择目标P-GW；其中，所述请求类型包括通过初始附着流程接入的所述EPC、通过切换流程接入的所述EPC或者通过多接入流程接入的所述EPC；
    所述非3GPP接入网关根据所述目标APN和所述目标P-GW的标识，为所述目标APN建立所述非3GPP接入网关与所述目标P-GW之间的分组数据网络PDN连接。
  23. 根据权利要求22所述的方法，其特征在于，所述非3GPP接入网关根据所述UE的请求类型，从所述移动性管理网元选择的P-GW和所述目标APN对应的APN配置参数中的P-GW中选择目标P-GW，包括：
    如果所述请求类型为通过初始附着流程接入的所述EPC，所述非3GPP接入网关选择所述MME选择的P-GW为所述目标P-GW；或者，
    如果所述请求类型为通过切换流程或多接入流程接入的所述EPC，所述非3GPP接入网关选择所述目标APN对应的APN配置参数中的P-GW为所述目标P-GW。
  24. 根据权利要求22或23任一项所述的方法，其特征在于，所述方法还包括：
    如果所述PDN连接建立成功，所述非3GPP接入网关将所述目标P-GW的标 识发送给所述移动性管理网元。
  25. 根据权利要求22-24任一项所述的方法，所述非3GPP接入网关向移动性管理网元发送请求消息之前，所述方法还包括：
    所述非3GPP接入网关根据预配置信息，选择所述移动性管理网元；其中，所述预配置信息包含所述UE的位置信息与所述移动性管理网元的标识的对应关系，或者所述预配置信息包含所述非3GPP接入网关的标识与所述移动性管理网元的标识的对应关系；
    或者，
    所述非3GPP接入网关将所述UE的国际移动用户识别码IMSI发送给路由代理节点，以便所述路由代理节点根据所述UE的IMSI为所述UE选择所述移动性管理网元；
    或者，
    所述非3GPP接入网关根据所述UE的位置信息构造移动性管理网元的完全合格域名，并将所述完全合格域名发送给域名解析服务器DNS，接收所述DNS根据所述完全合格域名确定的移动性管理网元的标识，从所述DNS确定的移动性管理网元中选择移动性管理网元作为所述移动性管理网元。
  26. 一种移动性管理网元，其特征在于，包括：
    接收单元，用于在用户设备UE从非第三代伙伴计划3GPP网络接入到演进分组核心网EPC之后，接收非3GPP接入网关发送的请求消息；
    确定单元，用于确定所述UE的请求类型，所述请求类型包括通过初始附着流程接入的所述EPC、通过切换流程接入的所述EPC或者通过多接入流程接入的所述EPC；
    选择单元，用于根据所述请求类型，为所述UE的目标接入点名称APN选择目标P-GW；
    发送单元，用于根据所述请求消息，向所述非3GPP接入网关返回响应消息，所述响应消息中包含所述目标APN以及所述目标P-GW的标识。
  27. 根据权利要求26所述的移动性管理网元，其特征在于，所述发送单元还用于在向所述非3GPP接入网关返回响应消息之后，向归属用户服务器HSS 发送通知消息，所述通知消息包含所述目标APN和所述目标P-GW的标识。
  28. 根据权利要求27所述的移动性管理网元，其特征在于，所述确定单元还用于在所述发送单元向所述HSS发送通知消息之前，确定为所述目标APN建立的所述非3GPP接入网关与所述目标P-GW之间的分组数据网PDN建立成功。
  29. 根据权利要求26-28任一项所述的移动性管理网元，其特征在于，所述请求消息为所述非3GPP接入网关发送的鉴权与授权请求消息；所述响应消息为鉴权与授权回复消息。
  30. 根据权利要求26-29任一项所述的移动性管理网元，其特征在于，所述发送单元具体用于，若所述UE的签约数据中所述目标APN对应的APN配置参数不包含P-GW的标识，则在所述目标APN对应的APN配置参数中增加所述目标P-GW的标识；若所述目标APN对应的APN配置参数中包含的P-GW的标识不是所述目标P-GW的标识，则将所述目标APN对应的APN配置参数中的P-GW的标识替换为所述目标P-GW的标识；向所述非3GPP接入网关发送鉴权与授权回复消息，所述鉴权与授权回复消息中包含所述目标APN对应的APN配置参数，所述目标APN对应的APN配置参数中包含所述目标APN和所述目标P-GW的标识。
  31. 根据权利要求26-30任一项所述的移动性管理网元，其特征在于，所述确定单元具体用于通过确定所述移动性管理网元中是否存在所述UE的与所述目标APN对应的上下文，确定所述请求类型；或者，
    所述请求消息中包含所述请求类型或者所述请求类型的信息，通过所述请求消息确定所述请求类型；或者，
    接收所述非3GPP接入网关发送的所述请求类型或者所述请求类型的信息。
  32. 根据权利要求26-31任一项所述的移动性管理网元，其特征在于，所述确定单元还用于在确定所述UE的请求类型之前，确定所述UE是从非3GPP网络接入所述EPC的。
  33. 根据权利要求26-32任一项所述的移动性管理网元，其特征在于，所述选择单元具体用于如果所述请求类型为通过初始附着流程接入的所述EPC 的情况下，根据所述目标APN选择所述目标P-GW；或者，
    如果所述请求类型为通过切换流程或多接入流程接入的所述EPC，获取所述UE的签约数据中所述目标APN对应APN配置参数中的P-GW的标识，将所述目标APN对应APN配置参数中的P-GW作为所述目标P-GW。
  34. 根据权利要求33所述的移动性管理网元，其特征在于，所述选择单元根据所述目标APN选择所述目标P-GW包括：
    所述选择单元根据所述目标APN和所述非3GPP接入网关的标识，选择目标P-GW；或者，
    所述选择单元根据所述目标APN和所述UE的本地网络之间互连的协议IP地址，选择目标P-GW；其中，所述UE的本地IP地址为所述非3GPP接入网为所述UE分配的IP地址。
  35. 根据权利要求26-34任一项所述的移动性管理网元，其特征在于，所述选择单元还用于在根据所述确定单元确定的所述请求类型，为所述目标APN选择目标P-GW之前，确定所述UE的目标APN。
  36. 一种接入网关，其特征在于，所述接入网关为非第三代伙伴计划3GPP网络的接入网关，所述接入网关包括：
    发送单元，用于在用户设备UE从所述非3GPP网络接入到演进分组核心网EPC之后，向移动性管理网元发送请求消息；
    接收单元，用于接收所述移动性管理网元根据所述请求消息发送的响应消息，所述响应消息中包含所述UE的目标接入点名称APN和为所述目标APN选择的目标P-GW的标识；
    建立单元，用于根据所述目标APN和所述目标P-GW的标识，为所述目标APN建立所述接入网关与所述目标P-GW之间的分组数据网PDN连接。
  37. 根据权利要求36所述的接入网关，其特征在于，还包括：
    确定单元，用于在所述接收单元接收移动性管理网元发送的所述UE的目标接入点名称APN和目标P-GW的标识之前，确定所述UE的请求类型，所述请求类型包括通过初始附着流程接入的所述EPC、通过切换流程接入的所述EPC或者通过多接入流程接入的所述EPC；
    则所述发送单元还用于在所述接收单元接收移动性管理网元发送的所述UE的目标接入点名称APN和目标P-GW的标识之前，将所述请求类型或者所述请求类型的信息发送给所述移动性管理网元。
  38. 根据权利要求36或37所述的接入网关，其特征在于，所述发送单元还用于在所述PDN连接建立成功之后，向所述移动性管理网元发送通知消息，所述通知消息包含用于指示所述PDN连接建立成功的指示信息。
  39. 一种移动性管理网元，其特征在于，包括：
    接收单元，用于在用户设备UE从非第三代伙伴计划3GPP网络接入到演进分组核心网EPC之后，接收非3GPP接入网关发送的请求消息；
    选择单元，用于根据所述UE的目标接入点名称APN选择P-GW；
    获取单元，获取所述UE的签约数据中所述目标APN对应的APN配置参数中的P-GW的标识；
    发送单元，用于根据所述请求消息，向所述非3GPP接入网关返回响应消息，所述响应消息中包含所述UE的目标APN、所述移动性管理网元选择的P-GW的标识和所述目标APN对应的APN配置参数中的P-GW的标识，以便所述非3GPP接入网关从所述移动性管理网元选择的P-GW和所述目标APN对应的APN配置参数中的P-GW中为所述目标APN选择目标P-GW。
  40. 根据权利要求39所述的移动性管理网元，其特征在于，所述接收单元还用于接收所述非3GPP接入网关发送的所述目标P-GW的标识；
    所述发送单元还用于向归属用户服务器HSS发送通知消息，所述通知消息包含所述目标APN和所述目标P-GW的标识。
  41. 根据权利要求39或40所述的移动性管理网元，其特征在于，所述请求消息为所述非3GPP接入网关发送的鉴权与授权请求消息；所述响应消息为鉴权与授权回复消息。
  42. 根据权利要求39至41任一项所述的移动性管理网元，其特征在于，所述发送单元根据所述请求消息，向所述非3GPP接入网关返回响应消息包括：
    所述发送单元在所述响应消息中增加用于指示所述移动性管理网元选择的P-GW的标识的第一参数，并向所述非3GPP接入网关发送所述响应消息，所 述响应消息中包含所述目标APN对应的APN配置参数和所述第一参数；或者，
    所述发送单元在所述目标APN对应的APN配置参数中增加用于指示移动性管理网元选择的P-GW的标识的第二参数，并向所述非3GPP接入网关发送所述响应消息，所述响应消息中包含所述目标APN对应的APN配置参数，所述目标APN对应的APN配置参数中包含所述第二参数。
  43. 根据权利要求39至42任一项所述的移动性管理网元，其特征在于，所述选择单元还用于在根据所述UE的APN选择P-GW之前，确定所述UE是从非3GPP网络接入所述EPC的。
  44. 根据权利要求39至43任一项所述的移动性管理网元，其特征在于，所述选择单元具体用于根据所述目标APN和所述非3GPP接入网关的标识，选择目标P-GW；或者，根据所述目标APN和所述UE的本地IP地址，选择目标P-GW；其中，所述UE的本地IP地址为所述非3GPP接入网为所述UE分配的IP地址。
  45. 根据权利要求39至44任一项所述的移动性管理网元，其特征在于，所述选择单元还用于在根据所述UE的APN选择P-GW之前，确定所述UE的目标APN。
  46. 一种接入网关，其特征在于，所述接入网关为非第三代伙伴计划3GPP网络的接入网关，所述接入网关包括：
    发送单元，用于在用户设备UE从所述非3GPP网络接入到演进分组核心网EPC之后，向移动性管理网元发送请求消息；
    接收单元，用于接收所述移动性管理网元根据所述请求消息发送的响应消息，所述响应消息中包含所述UE的目标接入点名称APN、所述移动性管理网元选择的P-GW的标识和所述UE的签约数据中所述目标APN对应的APN配置参数中的P-GW的标识；
    选择单元，用于根据所述UE的请求类型，从所述移动性管理网元选择的P-GW和所述目标APN对应的APN配置参数中的P-GW中为所述UE的目标APN选择目标P-GW；其中，所述请求类型包括通过初始附着流程接入的所述EPC、通过切换流程接入的所述EPC或者通过多接入流程接入的所述EPC；
    建立单元，用于根据所述目标APN和所述目标P-GW的标识，为所述目标 APN建立所述接入网关与所述目标P-GW之间的分组数据网络PDN连接。
  47. 根据权利要求46所述的接入网关，其特征在于，所述选择单元具体用于如果所述请求类型为通过初始附着流程接入的所述EPC，选择所述MME选择的P-GW为所述目标P-GW；或者，
    如果所述请求类型为通过切换流程或多接入流程接入的所述EPC，选择所述目标APN对应的APN配置参数中的P-GW为所述目标P-GW。
  48. 根据权利要求46或47所述的接入网关，其特征在于，所述发送单元还用于在所述PDN连接建立成功的情况下，将所述目标P-GW的标识发送给所述移动性管理网元。
  49. 一种移动性管理网元，其特征在于，所述移动性管理网元包括处理器、存储器、总线和通信接口；
    所述存储器用于存储计算机执行指令，所述处理器与所述存储器通过所述总线连接，当所述移动性管理网元运行时，所述处理器执行所述存储器存储的所述计算机执行指令，以使所述移动性管理网元执行如权利要求1-10中任一项所述的P-GW选择的方法或者如权利要求15-21中任一项所述的P-GW选择的方法。
  50. 一种接入网关，其特征在于，所述接入网关为非第三代伙伴计划3GPP网络的接入网关，所述接入网关包括处理器、存储器、总线和通信接口；
    所述存储器用于存储计算机执行指令，所述处理器与所述存储器通过所述总线连接，当，所述接入网关运行时，所述处理器执行所述存储器存储的所述计算机执行指令，以使，所述接入网关执行如权利要求11-14中任一项所述的P-GW选择的方法或者如权利要求22-25中任一项所述的P-GW选择的方法。
  51. 一种用于分组数据网关P-GW选择的系统，其特征在于，包括如权利要求26-35中任一项所述的移动性管理网元和如权利要求36-38中任一项所述的接入网关；或者
    包括如权利要求39-45中任一项所述的移动性管理网元和如权利要求46-48中任一项所述的接入网关。
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